-21=7u+7(u-7)

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Solution for -21=7u+7(u-7) equation:


-21=7u+7 (u-7)

We simplify the equation to the form, which is simple to understand 
-21=7u+7(u-7)

Reorder the terms in parentheses
-21=7u+(+7u-49)

Remove unnecessary parentheses
-21=+7u+7u-49

We move all terms containing u to the left and all other terms to the right. 
-7u-7u=-49+21

We simplify left and right side of the equation. 
-14u=-28

We divide both sides of the equation by -14 to get u. 
u=2

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