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u/7-13=-2
We move all terms to the left:
u/7-13-(-2)=0
We add all the numbers together, and all the variables
u/7-11=0
We multiply all the terms by the denominator
u-11*7=0
We add all the numbers together, and all the variables
u-77=0
We move all terms containing u to the left, all other terms to the right
u=77
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