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(a+14)+(5a+13)+(a+20)=180
We move all terms to the left:
(a+14)+(5a+13)+(a+20)-(180)=0
We get rid of parentheses
a+5a+a+14+13+20-180=0
We add all the numbers together, and all the variables
7a-133=0
We move all terms containing a to the left, all other terms to the right
7a=133
a=133/7
a=19
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