7u=9+8u

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Solution for 7u=9+8u equation: 



7u=9+8u

We move all terms to the left:

7u-(9+8u)=0

We add all the numbers together, and all the variables

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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