123-5x=4x+15

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Solution for 123-5x=4x+15 equation:


Simplifying
123 + -5x = 4x + 15

Reorder the terms:
123 + -5x = 15 + 4x

Solving
123 + -5x = 15 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
123 + -5x + -4x = 15 + 4x + -4x

Combine like terms: -5x + -4x = -9x
123 + -9x = 15 + 4x + -4x

Combine like terms: 4x + -4x = 0
123 + -9x = 15 + 0
123 + -9x = 15

Add '-123' to each side of the equation.
123 + -123 + -9x = 15 + -123

Combine like terms: 123 + -123 = 0
0 + -9x = 15 + -123
-9x = 15 + -123

Combine like terms: 15 + -123 = -108
-9x = -108

Divide each side by '-9'.
x = 12

Simplifying
x = 12

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