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180-(90+2x)=x
We move all terms to the left:
180-(90+2x)-(x)=0
We add all the numbers together, and all the variables
-(2x+90)-x+180=0
We add all the numbers together, and all the variables
-1x-(2x+90)+180=0
We get rid of parentheses
-1x-2x-90+180=0
We add all the numbers together, and all the variables
-3x+90=0
We move all terms containing x to the left, all other terms to the right
-3x=-90
x=-90/-3
x=+30
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