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51=2u+17
We move all terms to the left:
51-(2u+17)=0
We get rid of parentheses
-2u-17+51=0
We add all the numbers together, and all the variables
-2u+34=0
We move all terms containing u to the left, all other terms to the right
-2u=-34
u=-34/-2
u=+17
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