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-(x+3)=x+5
We move all terms to the left:
-(x+3)-(x+5)=0
We get rid of parentheses
-x-x-3-5=0
We add all the numbers together, and all the variables
-2x-8=0
We move all terms containing x to the left, all other terms to the right
-2x=8
x=8/-2
x=-4
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