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10=u/2-10
We move all terms to the left:
10-(u/2-10)=0
We get rid of parentheses
-u/2+10+10=0
We multiply all the terms by the denominator
-u+10*2+10*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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