12+x+3=

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Solution for 12+x+3= equation: 


Simplifying
12 + x + 3 = 0

Reorder the terms:
12 + 3 + x = 0

Combine like terms: 12 + 3 = 15
15 + x = 0

Solving
15 + x = 0

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + x = 0 + -15

Combine like terms: 15 + -15 = 0
0 + x = 0 + -15
x = 0 + -15

Combine like terms: 0 + -15 = -15
x = -15

Simplifying
x = -15

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