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2x+61+180-2(x+30.5)=180
We move all terms to the left:
2x+61+180-2(x+30.5)-(180)=0
We add all the numbers together, and all the variables
2x-2(x+30.5)+61=0
We multiply parentheses
2x-2x-61+61=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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