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4=u/2-16
We move all terms to the left:
4-(u/2-16)=0
We get rid of parentheses
-u/2+16+4=0
We multiply all the terms by the denominator
-u+16*2+4*2=0
We add all the numbers together, and all the variables
-1u+40=0
We move all terms containing u to the left, all other terms to the right
-u=-40
u=-40/-1
u=+40
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