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-2(u+-25)=84
We move all terms to the left:
-2(u+-25)-(84)=0
We add all the numbers together, and all the variables
-2(u-25)-84=0
We multiply parentheses
-2u+50-84=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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