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25=u/5-15
We move all terms to the left:
25-(u/5-15)=0
We get rid of parentheses
-u/5+15+25=0
We multiply all the terms by the denominator
-u+15*5+25*5=0
We add all the numbers together, and all the variables
-1u+200=0
We move all terms containing u to the left, all other terms to the right
-u=-200
u=-200/-1
u=+200
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