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8u=5u+12
We move all terms to the left:
8u-(5u+12)=0
We get rid of parentheses
8u-5u-12=0
We add all the numbers together, and all the variables
3u-12=0
We move all terms containing u to the left, all other terms to the right
3u=12
u=12/3
u=4
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