31-x=13

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Solution for 31-x=13 equation: 


Simplifying
31 + -1x = 13

Solving
31 + -1x = 13

Solving for variable 'x'.

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

Add '-31' to each side of the equation.
31 + -31 + -1x = 13 + -31

Combine like terms: 31 + -31 = 0
0 + -1x = 13 + -31
-1x = 13 + -31

Combine like terms: 13 + -31 = -18
-1x = -18

Divide each side by '-1'.
x = 18

Simplifying
x = 18

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