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63=4u+3u
We move all terms to the left:
63-(4u+3u)=0
We add all the numbers together, and all the variables
-(+7u)+63=0
We get rid of parentheses
-7u+63=0
We move all terms containing u to the left, all other terms to the right
-7u=-63
u=-63/-7
u=+9
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