-15+3=-x

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Solution for -15+3=-x equation:


Simplifying
-15 + 3 = -1x

Combine like terms: -15 + 3 = -12
-12 = -1x

Solving
-12 = -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
-12 + x = -1x + x

Combine like terms: -1x + x = 0
-12 + x = 0

Add '12' to each side of the equation.
-12 + 12 + x = 0 + 12

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

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

Simplifying
x = 12

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