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u/4+12=20
We move all terms to the left:
u/4+12-(20)=0
We add all the numbers together, and all the variables
u/4-8=0
We multiply all the terms by the denominator
u-8*4=0
We add all the numbers together, and all the variables
u-32=0
We move all terms containing u to the left, all other terms to the right
u=32
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