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+(2A+40)=180
We move all terms to the left:
+(2A+40)-(180)=0
We get rid of parentheses
2A+40-180=0
We add all the numbers together, and all the variables
2A-140=0
We move all terms containing A to the left, all other terms to the right
2A=140
A=140/2
A=70
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