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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

8u-7u-9=0

We add all the numbers together, and all the variables

u-9=0

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

u=9

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