-31=-13+x

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Solution for -31=-13+x equation:


Simplifying
-31 = -13 + x

Solving
-31 = -13 + x

Solving for variable 'x'.

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

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

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

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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