X+(-3)=-12

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Solution for X+(-3)=-12 equation: 


Simplifying
X + (-3) = -12
X + -3 = -12

Reorder the terms:
-3 + X = -12

Solving
-3 + X = -12

Solving for variable 'X'.

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

Add '3' to each side of the equation.
-3 + 3 + X = -12 + 3

Combine like terms: -3 + 3 = 0
0 + X = -12 + 3
X = -12 + 3

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

Simplifying
X = -9

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