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8+u/2=12
We move all terms to the left:
8+u/2-(12)=0
We add all the numbers together, and all the variables
u/2-4=0
We multiply all the terms by the denominator
u-4*2=0
We add all the numbers together, and all the variables
u-8=0
We move all terms containing u to the left, all other terms to the right
u=8
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