-1+2u+7u=8u-9

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Solution for -1+2u+7u=8u-9 equation: 



-1+2u+7u=8u-9

We move all terms to the left:

-1+2u+7u-(8u-9)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

9u-8u+9-1=0

We add all the numbers together, and all the variables

u+8=0

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

u=-8

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