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u/2+15=13
We move all terms to the left:
u/2+15-(13)=0
We add all the numbers together, and all the variables
u/2+2=0
We multiply all the terms by the denominator
u+2*2=0
We add all the numbers together, and all the variables
u+4=0
We move all terms containing u to the left, all other terms to the right
u=-4
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