Solve the equation [0.4 + x] × 6 = 5.40.4 + X. This is an unknown number × 6 is a multiplication sign

Solve the equation [0.4 + x] × 6 = 5.40.4 + X. This is an unknown number × 6 is a multiplication sign

【0.4+x】×6=5.4
0.4+x=5.4÷6
0.4+x=0.9
x=0.9-0.4
x=0.5

To solve the equation, note that the large one is the unknown number x, and the small one is the multiplication sign ×: (0.4 × 60 + 70% X × 0.4) / (60 + x) = 0.36

(0.4×60＋70％X×0.4)÷﹙60＋X﹚＝0.36
(24+0.28X)=0.36×(60+X)
24+0.28X=21.6+0.36X
0.36X-0.28X=24-21.6
0.08X=2.4
X=30

Solving equation: 4 / 5x1 / 4-1 / 2x = 1 / 20

4/5X1/4-1/2X=1/20
1/5-1/2x=1/20
1/5-1/20=1/2x
4/20-1/20=1/2x
3/20=1/2x
x=3/10

(3.6-2.8) x (unknown number) x (multiplier sign) 5 / 6 (five sixths) - 2.8x (unknown number) = 24

(3.6-2.8)x × 5/6-2.8x=24
0.8x×5/6-2.8x=24
2/3x-2.8x=24
6.4/3x=24
x=45/4

Using factorization to solve equation a ^ 2x ^ 2 + 2A ^ 2x + A ^ 2-B ^ 2 = 0 (a ≠ 0, X is unknown)

Solution = a ^ 2 (x ^ 2 + 2x + 1) - B ^ 2 = a ^ 2 (x + 1) ^ 2-B ^ 2 = [a (x + 1) + b] [a (x + 1) - b] = 0
A (x + 1) + B = 0 or a (x + 1) + B = 0
If x + 1 = - B / A or x + 1 = B / A, then x = - 1-B / A or - 1 + B / A

5.4x divided by 0.4 equals 0.5 divided by 3 / 5. What's x?

27X/5:2/5=1/2:3/5
27X/5*3/5=2/5*1/2
81X/25=1/5
X=1/5*25/81
X=5/81

One minus four fifths times x equals seven eighths. 1-five times 4x equals seven eighths. Fast
I don't know/

1-4/5*x=7/8
4/5*x=1-7/8=1/8
x=1/8*5/4=5/32

One minus four fifths times x equals seven eighths, and one-fifth of 4x equals seven eighths

1-4/5 *x=8/7
1-5/4x=8/7
The first x = - 5 / 28
The second x = - 35 / 4

4X minus 50% makes 6 equal to 12, so how much is x equal to

（4x-5）×6=12；
4x-5=2;
4x=7;
x=7/4;

6 times 5.4 minus 2.4x equals 12.6

6*5.4-2.4x=12.6
32.4-2.4x=12.6
2.4x=32.4-12.6
2.4x=19.8
x=8.25