7u=8u-9

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Solution for 7u=8u-9 equation: 



7u=8u-9

We move all terms to the left:

7u-(8u-9)=0

We get rid of parentheses

7u-8u+9=0

We add all the numbers together, and all the variables

-1u+9=0

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

-u=-9

u=-9/-1

u=+9

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