-1+9u=8u-7

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Solution for -1+9u=8u-7 equation: 



-1+9u=8u-7

We move all terms to the left:

-1+9u-(8u-7)=0

We get rid of parentheses

9u-8u+7-1=0

We add all the numbers together, and all the variables

u+6=0

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

u=-6

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