-7+8u=9u

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



-7+8u=9u

We move all terms to the left:

-7+8u-(9u)=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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