(72-6.8) x = 19.56 equation solving

(72-6.8) x = 19.56 equation solving

65.2x=19.56
x=19.56÷65.2
x=0.3

3.5（2-2X）=5.9-1.5X

7-7x=5.9-1.5x
1.1=5.5x
x=0.2

13x-4 (2x + 5) = 17 (X-2) - 4 (2x-1)

13x-8x-20=17x-34-8x+4
5x-20=9x-30
-4x=-10
x=2.5

5x/8+(3/8)*8.4=(1+0.25)*9.6

5x/8+(3/8)*8.4=(1+0.25)*9.6
5x/8+3.15=12
5x/8=8.85
x=14.16

There are 20 chickens and rabbits in total. There are 54 legs. How many chickens and rabbits are there?

Suppose there are x rabbits and (20-x) chickens, then the number of chicken legs is 2 (20-x) and the number of rabbit legs is 4x
2（20-x）+4x=54
40-2x+4x=54
x=7
Chicken 13
Seven rabbits

There are 20 chickens and rabbits in total. There are 54 legs. Do you know how many chickens and rabbits are there

Suppose there are x rabbits and (20-x) chickens
4x+2（20-x）=54
4x+40-2x=54
4x-2x=54-40
2x=14
x=7
Chicken: 20-7 = 13
A: there are 7 rabbits and 13 chickens

There are 100 chickens and rabbits in total, and the number of legs of chickens is 30 less than that of rabbits. How many of them are there?
It's really wrong. There are 100 chickens and rabbits in total. The number of legs of the chicken is 34 less than that of the rabbit. How many of them are there?

There are x rabbits and (100-x) chickens
2(100-x)+34=4x
6x=234
x=39
Chicken: 100-39 = 61
A: there are 39 rabbits and 61 chickens

There are 100 chickens and rabbits in total, and the number of legs of chickens is 28 less than that of rabbits. How many of them are there?

Suppose there are x rabbits, then there are 100-x chickens, 4x - (100-x) × 2 = 28, 4x-200 + 2x = 28, 4x-200 + 2x = 28, 4x-200 + 2x = 62, a: there are 62 chickens and 38 rabbits

There are 100 chickens and rabbits in total, and the number of legs of chickens is 28 less than that of rabbits. How many of them are there?

Suppose there are x rabbits, then there are 100-x chickens, 4x - (100-x) × 2 = 28, 4x-200 + 2x = 28, 4x-200 + 2x = 28, 4x-200 + 2x = 62, a: there are 62 chickens and 38 rabbits

There were 100 chickens and 100 rabbits. The number of legs of chickens was 28 less than that of rabbits
Explanation is required

There were 100 chickens and rabbits. The number of legs of chickens was 28 less than that of rabbits. There were 62 chickens and 38 rabbits
Rabbit (2 × 100 + 28) / (2 + 4)
=228÷6
=38
Chicken 100-38 = 62