X+-9=-12

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Solution for X+-9=-12 equation: 


Simplifying
X + -9 = -12

Reorder the terms:
-9 + X = -12

Solving
-9 + X = -12

Solving for variable 'X'.

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

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

Combine like terms: -9 + 9 = 0
0 + X = -12 + 9
X = -12 + 9

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

Simplifying
X = -3

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