10x + 6-x + 18 = 10 * (6-x) + X to solve the equation

10x + 6-x + 18 = 10 * (6-x) + X to solve the equation

10x+6-x+18=10*（6-x）+x
10x+6-x+18=60-10x+x
10x-x+10x-x=60-6-18
18x=36
x=2

10x + 1 - (10 + x) = 18 solution of one variable linear equation

The original formula is: 10x + 1-10-x = 18,
The result is: 9x-9 = 18,
9x=27,
x=27/9=3.

X x （1+1/10)-X=1/10X
We should do it step by step,

Is the right side of the equation 1 / 10 times X or 1 / 10x?
If the former:
(1+1/10)x-x=x/10
x+x/10-x=x/10
x/10=x/10
0=0
The solution of X is arbitrary
In the latter case:
(1+1/10)x-x=1/10x
x+x/10-x=1/10x
x/10=1/10x
x=1/100x
100x²=1
x²=1/100
x=±1/10

Solve an equation 10x + 6 (10-x) = 80

10X+6(10-X)=80
10X+60-6X=80
4X=20
X=5