-9u=-7-8u

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Solution for -9u=-7-8u equation: 



-9u=-7-8u

We move all terms to the left:

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

We add all the numbers together, and all the variables

-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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