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9=2(u+3)+1
We move all terms to the left:
9-(2(u+3)+1)=0
We calculate terms in parentheses: -(2(u+3)+1), so:We get rid of parentheses
2(u+3)+1
We multiply parentheses
2u+6+1
We add all the numbers together, and all the variables
2u+7
Back to the equation:
-(2u+7)
-2u-7+9=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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