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(2a+62)+(54-a)+(5a-20)=180
We move all terms to the left:
(2a+62)+(54-a)+(5a-20)-(180)=0
We add all the numbers together, and all the variables
(2a+62)+(-1a+54)+(5a-20)-180=0
We get rid of parentheses
2a-1a+5a+62+54-20-180=0
We add all the numbers together, and all the variables
6a-84=0
We move all terms containing a to the left, all other terms to the right
6a=84
a=84/6
a=14
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