123=10x+3+2x

Solution for 123=10x+3+2x equation:

Simplifying
123 = 10x + 3 + 2x

Reorder the terms:
123 = 3 + 10x + 2x

Combine like terms: 10x + 2x = 12x
123 = 3 + 12x

Solving
123 = 3 + 12x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-12x' to each side of the equation.
123 + -12x = 3 + 12x + -12x

Combine like terms: 12x + -12x = 0
123 + -12x = 3 + 0
123 + -12x = 3

Add '-123' to each side of the equation.
123 + -123 + -12x = 3 + -123

Combine like terms: 123 + -123 = 0
0 + -12x = 3 + -123
-12x = 3 + -123

Combine like terms: 3 + -123 = -120
-12x = -120

Divide each side by '-12'.
x = 10

Simplifying
x = 10