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3(u+63)=-51
We move all terms to the left:
3(u+63)-(-51)=0
We add all the numbers together, and all the variables
3(u+63)+51=0
We multiply parentheses
3u+189+51=0
We add all the numbers together, and all the variables
3u+240=0
We move all terms containing u to the left, all other terms to the right
3u=-240
u=-240/3
u=-80
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