Solve for y
y=4
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12-3y=0
Add 3 and 9 to get 12.
-3y=-12
Subtract 12 from both sides. Anything subtracted from zero gives its negation.
y=\frac{-12}{-3}
Divide both sides by -3.
y=4
Divide -12 by -3 to get 4.
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