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u/5-15=3
We move all terms to the left:
u/5-15-(3)=0
We add all the numbers together, and all the variables
u/5-18=0
We multiply all the terms by the denominator
u-18*5=0
We add all the numbers together, and all the variables
u-90=0
We move all terms containing u to the left, all other terms to the right
u=90
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