How to solve the equation of 10x-x = 3

How to solve the equation of 10x-x = 3

10X-X=3
9x=3
x=3/9
x=1/3

How to solve the equation of 10x - (10-x) 3 = 74?

10x-(10-x)3=74
10X-30+3X=74
13X=104
X=104/13
X=8

If the solution of the equation 10x-m = 0 about X is equal to the value of 3-2m, then x is equal to?
To explain the process, O (∩)_ Thank you

10x-m = 0, the solution is: x = m / 10
∴m/10=3-2m
m=30-20m
m+20m=30
21m=30
m=10/7
In this case, x = 1 / 7

How to solve the equation (100-x) * 1 / 3-1 / 10x = 16

（100-X）*1/3-1/10X=16
10*（100-X）-3X=16*3*10
1000-10X-3X=480
13X=1000-480
13X=520
X=40