-x=9+3

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Solution for -x=9+3 equation: 


Simplifying
-1x = 9 + 3

Combine like terms: 9 + 3 = 12
-1x = 12

Solving
-1x = 12

Solving for variable 'x'.

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

Divide each side by '-1'.
x = -12

Simplifying
x = -12

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