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