Solve for y
y=4
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-6y+3y+21=9
Use the distributive property to multiply 3 by y+7.
-3y+21=9
Combine -6y and 3y to get -3y.
-3y=9-21
Subtract 21 from both sides.
-3y=-12
Subtract 21 from 9 to get -12.
y=\frac{-12}{-3}
Divide both sides by -3.
y=4
Divide -12 by -3 to get 4.
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