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180=40+40+2x+30
We move all terms to the left:
180-(40+40+2x+30)=0
We add all the numbers together, and all the variables
-(2x+110)+180=0
We get rid of parentheses
-2x-110+180=0
We add all the numbers together, and all the variables
-2x+70=0
We move all terms containing x to the left, all other terms to the right
-2x=-70
x=-70/-2
x=+35
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