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-1=2u-7
We move all terms to the left:
-1-(2u-7)=0
We get rid of parentheses
-2u+7-1=0
We add all the numbers together, and all the variables
-2u+6=0
We move all terms containing u to the left, all other terms to the right
-2u=-6
u=-6/-2
u=+3
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