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-8+6(u+3)=34
We move all terms to the left:
-8+6(u+3)-(34)=0
We add all the numbers together, and all the variables
6(u+3)-42=0
We multiply parentheses
6u+18-42=0
We add all the numbers together, and all the variables
6u-24=0
We move all terms containing u to the left, all other terms to the right
6u=24
u=24/6
u=4
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