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10u=84+2u
We move all terms to the left:
10u-(84+2u)=0
We add all the numbers together, and all the variables
10u-(2u+84)=0
We get rid of parentheses
10u-2u-84=0
We add all the numbers together, and all the variables
8u-84=0
We move all terms containing u to the left, all other terms to the right
8u=84
u=84/8
u=10+1/2
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