63=12u-3u

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Solution for 63=12u-3u equation: 



63=12u-3u

We move all terms to the left:

63-(12u-3u)=0

We add all the numbers together, and all the variables

-(+9u)+63=0

We get rid of parentheses

-9u+63=0

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

-9u=-63

u=-63/-9

u=+7

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