Solve for y
y=2
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18-4y-5y=0
Subtract 5y from both sides.
18-9y=0
Combine -4y and -5y to get -9y.
-9y=-18
Subtract 18 from both sides. Anything subtracted from zero gives its negation.
y=\frac{-18}{-9}
Divide both sides by -9.
y=2
Divide -18 by -9 to get 2.
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