The equation is solved. (1) x: 6 = 25 (2) 3.6x = 1.8 × 3 (3) 276 × 4 = 368x (4) 821 = 0.4x

The equation is solved. (1) x: 6 = 25 (2) 3.6x = 1.8 × 3 (3) 276 × 4 = 368x (4) 821 = 0.4x

（1）x：6=25，           5x=6×2，        5x÷5=12÷5，          ...

Solution proportion (important process) (X: 6 = 2 / 5) (276x4 = 368x) (3.6x = 1.8x3)

x: 6 = 2 / 5
x=2/5×6
x=12/5
276x4=368x
1104=368x
x=1104÷368
x=3
3.6x=1.8x3
3.6x=5.4
x=5.4/3.6
x=1.5

(x-0.25x = 3) how to solve the equation

x-0.25x=3
(1-0.25)x=3
0.75x=3
0.75x÷0.75=3÷0.75
x=4

Calculation: 25X (20-x) = 30x15

25x(20-x)=30x15
20-x=30×15÷25
20-x=18
x=20-18
x=2

The solution equation is 1.25x-x = 28

1.25X-X=28
（1.25-1）x=28
0.25x=28
x=28*4
x=112

7x-11 = 5x + 9 × 3 (x + 4-6) X4 △ 5 = 12

7x-11=5x+9×3
7x-5x=27+11
2x=38
x=19
（x+4-6）x4÷5=12
x-2=12×5÷4
x-2=15
x=17

2 / 5x-20% x = 120 solve equation 9 / 2 △ [(5 / 2 + 10 / 1) X4 / 3] to calculate

2/5x-20%x=120
0.4x-0.2x=120
0.2x=120
x=600
9/2÷[（5/2+10/1）X4/3]
=9/2÷[2/1×4/3）
=9/2×3/8
=27/16
Have a good time

Solution equation: (χ + 5 / 1) △ 9 = 2.3

(x+5/1)=2.3*9
x=2.3*9-5/1
x=15.7

Solution equation: 3 (a + 5) 2-2 (3-A) 2 + (9-A) (9 + a) = 0

Remove the brackets: 3a2 + 30A + 75-18 + 12a-2a2 + 81-a2 = 0, transfer and merge the similar items: 42a = - 138, the coefficient is 1, a = - 327

8 / 3 plus x = 7 / 6 how to solve the equation!

3/8+x=7/6
x=7/6-3/8
x=19/24