How to solve the equation with x-0.8x = 12.4?

0.2x=12.4
x=64

The solution equation: X (x-1) = 8x-12

X = (2 ± √ 33) / 9. When you write the answer, you leave out the brackets. I want you to understand it
Complement process: 1. X ^ 2-x = 8x-12
2.x^2-9x+12=0
3.△ =b^2-4ac=33
4.x=（2±√33 ）/9

Solution equation: 8x + 3 (X-2) = 5x + (x-3)

Solution
8x+3(x-2)=5x+(x-3)
8x+3x-6=5x+x-3
11x-6=6x-3
11x-6x=6-3
5x=3
x=3/5

Solve the equation 8x-5x = 1.8

8X-5X=1.8
3x=1.8
x=0.6

Fast solution of equation 5x + 30 = 8x-6

8x-5x=30+6
3x=36
x=36÷3
x=12

Solving equation [writing process] X-5 / 8x = 15 1 / 5x + 3 / 10x = 120 20% x = 30 (1-45%) x = 1.95

x-5/8x=15
(3/8)x=15
x=15*(8/3)
x=40
1/5x+3/10x=120
2/10x+3/10x=120
5/10x=120
x=120*2
x=240
20%x=30
x=30/20%
x=150
(1-45%)x=1.95
55%x=1.95
x=1.95/0.55
x=39/11

How to solve the equation of 8x + 10x = 9?

8+10=18
18x=9
X=9/18=0.5

How to solve the equation of 1.8x + x = 8.96

2.8x=8.96
x=3.2

The solution equation: 8.8x + x = 98

8.8x+x=98
9.8x=98
x=10

8x-0.2 1-0.2x = 0.01 0.1 + 0.02x

8x-0.2 1-0.2x = 0.01 0.1 + 0.02x
8x-5+x=10+2x;
9x-2x=10+5;
7x=15;
x=15/7;
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How to solve the equation with x-0.8x = 12.4?