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180=x+x+100
We move all terms to the left:
180-(x+x+100)=0
We add all the numbers together, and all the variables
-(2x+100)+180=0
We get rid of parentheses
-2x-100+180=0
We add all the numbers together, and all the variables
-2x+80=0
We move all terms containing x to the left, all other terms to the right
-2x=-80
x=-80/-2
x=+40
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