8=-8(u-91)

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Solution for 8=-8(u-91) equation: 



8=-8(u-91)

We move all terms to the left:

8-(-8(u-91))=0



We calculate terms in parentheses: -(-8(u-91)), so:

-8(u-91)

We multiply parentheses

-8u+728

Back to the equation:

-(-8u+728)



We get rid of parentheses

8u-728+8=0

We add all the numbers together, and all the variables

8u-720=0

We move all terms containing u to the left, all other terms to the right

8u=720

u=720/8

u=90

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