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8-(-u)=15
We move all terms to the left:
8-(-u)-(15)=0
We add all the numbers together, and all the variables
-(-1u)+8-15=0
We add all the numbers together, and all the variables
-(-1u)-7=0
We get rid of parentheses
1u-7=0
We add all the numbers together, and all the variables
u-7=0
We move all terms containing u to the left, all other terms to the right
u=7
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