31-x-12=15

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Solution for 31-x-12=15 equation: 


Simplifying
31 + -1x + -12 = 15

Reorder the terms:
31 + -12 + -1x = 15

Combine like terms: 31 + -12 = 19
19 + -1x = 15

Solving
19 + -1x = 15

Solving for variable 'x'.

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

Add '-19' to each side of the equation.
19 + -19 + -1x = 15 + -19

Combine like terms: 19 + -19 = 0
0 + -1x = 15 + -19
-1x = 15 + -19

Combine like terms: 15 + -19 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4

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