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7=u/8+5
We move all terms to the left:
7-(u/8+5)=0
We get rid of parentheses
-u/8-5+7=0
We multiply all the terms by the denominator
-u-5*8+7*8=0
We add all the numbers together, and all the variables
-1u+16=0
We move all terms containing u to the left, all other terms to the right
-u=-16
u=-16/-1
u=+16
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