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u/4-9=-8
We move all terms to the left:
u/4-9-(-8)=0
We add all the numbers together, and all the variables
u/4-1=0
We multiply all the terms by the denominator
u-1*4=0
We add all the numbers together, and all the variables
u-4=0
We move all terms containing u to the left, all other terms to the right
u=4
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