8u+7=9u-1

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



8u+7=9u-1

We move all terms to the left:

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

We get rid of parentheses

8u-9u+1+7=0

We add all the numbers together, and all the variables

-1u+8=0

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

-u=-8

u=-8/-1

u=+8

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