Solve for y
y=6
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-y-12+3y=0
Subtract 3 from -9 to get -12.
-y+3y=12
Add 12 to both sides. Anything plus zero gives itself.
2y=12
Combine -y and 3y to get 2y.
y=\frac{12}{2}
Divide both sides by 2.
y=6
Divide 12 by 2 to get 6.
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