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-6u+48=3(u+7)
We move all terms to the left:
-6u+48-(3(u+7))=0
We calculate terms in parentheses: -(3(u+7)), so:We get rid of parentheses
3(u+7)
We multiply parentheses
3u+21
Back to the equation:
-(3u+21)
-6u-3u-21+48=0
We add all the numbers together, and all the variables
-9u+27=0
We move all terms containing u to the left, all other terms to the right
-9u=-27
u=-27/-9
u=+3
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