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-(x+20)=19+x
We move all terms to the left:
-(x+20)-(19+x)=0
We add all the numbers together, and all the variables
-(x+20)-(x+19)=0
We get rid of parentheses
-x-x-20-19=0
We add all the numbers together, and all the variables
-2x-39=0
We move all terms containing x to the left, all other terms to the right
-2x=39
x=39/-2
x=-19+1/2
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