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-31=u/2
We move all terms to the left:
-31-(u/2)=0
We add all the numbers together, and all the variables
-(+u/2)-31=0
We get rid of parentheses
-u/2-31=0
We multiply all the terms by the denominator
-u-31*2=0
We add all the numbers together, and all the variables
-1u-62=0
We move all terms containing u to the left, all other terms to the right
-u=62
u=62/-1
u=-62
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