Solve for u
u=4
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4=4u-28+4u
Use the distributive property to multiply 4 by u-7.
4=8u-28
Combine 4u and 4u to get 8u.
8u-28=4
Swap sides so that all variable terms are on the left hand side.
8u=4+28
Add 28 to both sides.
8u=32
Add 4 and 28 to get 32.
u=\frac{32}{8}
Divide both sides by 8.
u=4
Divide 32 by 8 to get 4.
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