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u/3=-4
We move all terms to the left:
u/3-(-4)=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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