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-25=-u/3
We move all terms to the left:
-25-(-u/3)=0
We get rid of parentheses
u/3-25=0
We multiply all the terms by the denominator
u-25*3=0
We add all the numbers together, and all the variables
u-75=0
We move all terms containing u to the left, all other terms to the right
u=75
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