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-1=5+2u
We move all terms to the left:
-1-(5+2u)=0
We add all the numbers together, and all the variables
-(2u+5)-1=0
We get rid of parentheses
-2u-5-1=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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