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56+(180-6x)+(180-(180-2x)=180
We move all terms to the left:
56+(180-6x)+(180-(180-2x)-(180)=0
We add all the numbers together, and all the variables
(-6x+180)+(180-(-2x+180)-180+56=0
We get rid of parentheses
-6x+(180-(-2x+180)-180+56+180=0
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