3x+15+5x-12=4x+31

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Solution for 3x+15+5x-12=4x+31 equation:


Simplifying
3x + 15 + 5x + -12 = 4x + 31

Reorder the terms:
15 + -12 + 3x + 5x = 4x + 31

Combine like terms: 15 + -12 = 3
3 + 3x + 5x = 4x + 31

Combine like terms: 3x + 5x = 8x
3 + 8x = 4x + 31

Reorder the terms:
3 + 8x = 31 + 4x

Solving
3 + 8x = 31 + 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.
3 + 8x + -4x = 31 + 4x + -4x

Combine like terms: 8x + -4x = 4x
3 + 4x = 31 + 4x + -4x

Combine like terms: 4x + -4x = 0
3 + 4x = 31 + 0
3 + 4x = 31

Add '-3' to each side of the equation.
3 + -3 + 4x = 31 + -3

Combine like terms: 3 + -3 = 0
0 + 4x = 31 + -3
4x = 31 + -3

Combine like terms: 31 + -3 = 28
4x = 28

Divide each side by '4'.
x = 7

Simplifying
x = 7

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