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u/3-13=-9
We move all terms to the left:
u/3-13-(-9)=0
We add all the numbers together, and all the variables
u/3-4=0
We multiply all the terms by the denominator
u-4*3=0
We add all the numbers together, and all the variables
u-12=0
We move all terms containing u to the left, all other terms to the right
u=12
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