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-15=u/8-6
We move all terms to the left:
-15-(u/8-6)=0
We get rid of parentheses
-u/8+6-15=0
We multiply all the terms by the denominator
-u+6*8-15*8=0
We add all the numbers together, and all the variables
-1u-72=0
We move all terms containing u to the left, all other terms to the right
-u=72
u=72/-1
u=-72
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