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6(3u-1)=84
We move all terms to the left:
6(3u-1)-(84)=0
We multiply parentheses
18u-6-84=0
We add all the numbers together, and all the variables
18u-90=0
We move all terms containing u to the left, all other terms to the right
18u=90
u=90/18
u=5
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