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-9u=-8u+7

We move all terms to the left:

-9u-(-8u+7)=0

We get rid of parentheses

-9u+8u-7=0

We add all the numbers together, and all the variables

-1u-7=0

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

-u=7

u=7/-1

u=-7

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