9y-12y=-9-12

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Solution for 9y-12y=-9-12 equation: 


Simplifying
9y + -12y = -9 + -12

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

Combine like terms: -9 + -12 = -21
-3y = -21

Solving
-3y = -21

Solving for variable 'y'.

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

Divide each side by '-3'.
y = 7

Simplifying
y = 7

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