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u/4+-5=-8
We move all terms to the left:
u/4+-5-(-8)=0
We add all the numbers together, and all the variables
u/4+3=0
We multiply all the terms by the denominator
u+3*4=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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