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u/5-13=10
We move all terms to the left:
u/5-13-(10)=0
We add all the numbers together, and all the variables
u/5-23=0
We multiply all the terms by the denominator
u-23*5=0
We add all the numbers together, and all the variables
u-115=0
We move all terms containing u to the left, all other terms to the right
u=115
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