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(20-x)-(x+40)=180
We move all terms to the left:
(20-x)-(x+40)-(180)=0
We add all the numbers together, and all the variables
(-1x+20)-(x+40)-180=0
We get rid of parentheses
-1x-x+20-40-180=0
We add all the numbers together, and all the variables
-2x-200=0
We move all terms containing x to the left, all other terms to the right
-2x=200
x=200/-2
x=-100
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