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3u=6u-63
We move all terms to the left:
3u-(6u-63)=0
We get rid of parentheses
3u-6u+63=0
We add all the numbers together, and all the variables
-3u+63=0
We move all terms containing u to the left, all other terms to the right
-3u=-63
u=-63/-3
u=+21
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