12=x-9

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Solution for 12=x-9 equation:


Simplifying
12 = x + -9

Reorder the terms:
12 = -9 + x

Solving
12 = -9 + 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.
12 + -1x = -9 + x + -1x

Combine like terms: x + -1x = 0
12 + -1x = -9 + 0
12 + -1x = -9

Add '-12' to each side of the equation.
12 + -12 + -1x = -9 + -12

Combine like terms: 12 + -12 = 0
0 + -1x = -9 + -12
-1x = -9 + -12

Combine like terms: -9 + -12 = -21
-1x = -21

Divide each side by '-1'.
x = 21

Simplifying
x = 21

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