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8=u/4-15
We move all terms to the left:
8-(u/4-15)=0
We get rid of parentheses
-u/4+15+8=0
We multiply all the terms by the denominator
-u+15*4+8*4=0
We add all the numbers together, and all the variables
-1u+92=0
We move all terms containing u to the left, all other terms to the right
-u=-92
u=-92/-1
u=+92
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