12+x=-3

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Solution for 12+x=-3 equation: 


Simplifying
12 + x = -3

Solving
12 + x = -3

Solving for variable 'x'.

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

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

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

Combine like terms: -3 + -12 = -15
x = -15

Simplifying
x = -15

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