-9=x+21

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Solution for -9=x+21 equation:


Simplifying
-9 = x + 21

Reorder the terms:
-9 = 21 + x

Solving
-9 = 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.
-9 + -1x = 21 + x + -1x

Combine like terms: x + -1x = 0
-9 + -1x = 21 + 0
-9 + -1x = 21

Add '9' to each side of the equation.
-9 + 9 + -1x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + -1x = 21 + 9
-1x = 21 + 9

Combine like terms: 21 + 9 = 30
-1x = 30

Divide each side by '-1'.
x = -30

Simplifying
x = -30

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