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2u+7-(-8u)=23
We move all terms to the left:
2u+7-(-8u)-(23)=0
We add all the numbers together, and all the variables
2u-(-8u)-16=0
We get rid of parentheses
2u+8u-16=0
We add all the numbers together, and all the variables
10u-16=0
We move all terms containing u to the left, all other terms to the right
10u=16
u=16/10
u=1+3/5
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