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-5u+1=-7u-9
We move all terms to the left:
-5u+1-(-7u-9)=0
We get rid of parentheses
-5u+7u+9+1=0
We add all the numbers together, and all the variables
2u+10=0
We move all terms containing u to the left, all other terms to the right
2u=-10
u=-10/2
u=-5
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