Solve for y
y=8
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-4y+21=-12+y-7
Combine 2y and -6y to get -4y.
-4y+21=-19+y
Subtract 7 from -12 to get -19.
-4y+21-y=-19
Subtract y from both sides.
-5y+21=-19
Combine -4y and -y to get -5y.
-5y=-19-21
Subtract 21 from both sides.
-5y=-40
Subtract 21 from -19 to get -40.
y=\frac{-40}{-5}
Divide both sides by -5.
y=8
Divide -40 by -5 to get 8.
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