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-27=15+6u
We move all terms to the left:
-27-(15+6u)=0
We add all the numbers together, and all the variables
-(6u+15)-27=0
We get rid of parentheses
-6u-15-27=0
We add all the numbers together, and all the variables
-6u-42=0
We move all terms containing u to the left, all other terms to the right
-6u=42
u=42/-6
u=-7
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