-18=x+21

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Solution for -18=x+21 equation:


Simplifying
-18 = x + 21

Reorder the terms:
-18 = 21 + x

Solving
-18 = 21 + 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.
-18 + -1x = 21 + x + -1x

Combine like terms: x + -1x = 0
-18 + -1x = 21 + 0
-18 + -1x = 21

Add '18' to each side of the equation.
-18 + 18 + -1x = 21 + 18

Combine like terms: -18 + 18 = 0
0 + -1x = 21 + 18
-1x = 21 + 18

Combine like terms: 21 + 18 = 39
-1x = 39

Divide each side by '-1'.
x = -39

Simplifying
x = -39

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