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100+10x-80=-80-10x
We move all terms to the left:
100+10x-80-(-80-10x)=0
We add all the numbers together, and all the variables
10x-(-10x-80)+100-80=0
We add all the numbers together, and all the variables
10x-(-10x-80)+20=0
We get rid of parentheses
10x+10x+80+20=0
We add all the numbers together, and all the variables
20x+100=0
We move all terms containing x to the left, all other terms to the right
20x=-100
x=-100/20
x=-5
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