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-23=-8+5u
We move all terms to the left:
-23-(-8+5u)=0
We add all the numbers together, and all the variables
-(5u-8)-23=0
We get rid of parentheses
-5u+8-23=0
We add all the numbers together, and all the variables
-5u-15=0
We move all terms containing u to the left, all other terms to the right
-5u=15
u=15/-5
u=-3
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