Solve for u
u=-9
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11+15u-13u=-7
Subtract 13u from both sides.
11+2u=-7
Combine 15u and -13u to get 2u.
2u=-7-11
Subtract 11 from both sides.
2u=-18
Subtract 11 from -7 to get -18.
u=\frac{-18}{2}
Divide both sides by 2.
u=-9
Divide -18 by 2 to get -9.
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