Solve for u
u=9
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-3u+9=-18
Combine 7u and -10u to get -3u.
-3u=-18-9
Subtract 9 from both sides.
-3u=-27
Subtract 9 from -18 to get -27.
u=\frac{-27}{-3}
Divide both sides by -3.
u=9
Divide -27 by -3 to get 9.
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