9+3=x-12

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Solution for 9+3=x-12 equation:


Simplifying
9 + 3 = x + -12

Combine like terms: 9 + 3 = 12
12 = x + -12

Reorder the terms:
12 = -12 + x

Solving
12 = -12 + 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 = -12 + x + -1x

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

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

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

Combine like terms: -12 + -12 = -24
-1x = -24

Divide each side by '-1'.
x = 24

Simplifying
x = 24

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