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39=3(u-3)+5u
We move all terms to the left:
39-(3(u-3)+5u)=0
We calculate terms in parentheses: -(3(u-3)+5u), so:We get rid of parentheses
3(u-3)+5u
We add all the numbers together, and all the variables
5u+3(u-3)
We multiply parentheses
5u+3u-9
We add all the numbers together, and all the variables
8u-9
Back to the equation:
-(8u-9)
-8u+9+39=0
We add all the numbers together, and all the variables
-8u+48=0
We move all terms containing u to the left, all other terms to the right
-8u=-48
u=-48/-8
u=+6
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