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4=u/5-3
We move all terms to the left:
4-(u/5-3)=0
We get rid of parentheses
-u/5+3+4=0
We multiply all the terms by the denominator
-u+3*5+4*5=0
We add all the numbers together, and all the variables
-1u+35=0
We move all terms containing u to the left, all other terms to the right
-u=-35
u=-35/-1
u=+35
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