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23=7(u+3)-5u
We move all terms to the left:
23-(7(u+3)-5u)=0
We calculate terms in parentheses: -(7(u+3)-5u), so:We get rid of parentheses
7(u+3)-5u
We add all the numbers together, and all the variables
-5u+7(u+3)
We multiply parentheses
-5u+7u+21
We add all the numbers together, and all the variables
2u+21
Back to the equation:
-(2u+21)
-2u-21+23=0
We add all the numbers together, and all the variables
-2u+2=0
We move all terms containing u to the left, all other terms to the right
-2u=-2
u=-2/-2
u=1
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