9=-12-y

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Solution for 9=-12-y equation:


Simplifying
9 = -12 + -1y

Solving
9 = -12 + -1y

Solving for variable 'y'.

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

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

Combine like terms: -1y + y = 0
9 + y = -12 + 0
9 + y = -12

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

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

Combine like terms: -12 + -9 = -21
y = -21

Simplifying
y = -21

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