15x+42-12x-12=13+15x-31

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Solution for 15x+42-12x-12=13+15x-31 equation:


Simplifying
15x + 42 + -12x + -12 = 13 + 15x + -31

Reorder the terms:
42 + -12 + 15x + -12x = 13 + 15x + -31

Combine like terms: 42 + -12 = 30
30 + 15x + -12x = 13 + 15x + -31

Combine like terms: 15x + -12x = 3x
30 + 3x = 13 + 15x + -31

Reorder the terms:
30 + 3x = 13 + -31 + 15x

Combine like terms: 13 + -31 = -18
30 + 3x = -18 + 15x

Solving
30 + 3x = -18 + 15x

Solving for variable 'x'.

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

Add '-15x' to each side of the equation.
30 + 3x + -15x = -18 + 15x + -15x

Combine like terms: 3x + -15x = -12x
30 + -12x = -18 + 15x + -15x

Combine like terms: 15x + -15x = 0
30 + -12x = -18 + 0
30 + -12x = -18

Add '-30' to each side of the equation.
30 + -30 + -12x = -18 + -30

Combine like terms: 30 + -30 = 0
0 + -12x = -18 + -30
-12x = -18 + -30

Combine like terms: -18 + -30 = -48
-12x = -48

Divide each side by '-12'.
x = 4

Simplifying
x = 4

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