Solve for u
u=7
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-3u+7+9u=49
Add 9u to both sides.
6u+7=49
Combine -3u and 9u to get 6u.
6u=49-7
Subtract 7 from both sides.
6u=42
Subtract 7 from 49 to get 42.
u=\frac{42}{6}
Divide both sides by 6.
u=7
Divide 42 by 6 to get 7.
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