-63=9-8u

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Solution for -63=9-8u equation: 



-63=9-8u

We move all terms to the left:

-63-(9-8u)=0

We add all the numbers together, and all the variables

-(-8u+9)-63=0

We get rid of parentheses

8u-9-63=0

We add all the numbers together, and all the variables

8u-72=0

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

8u=72

u=72/8

u=9

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