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5a+(a+80)+(2a+200)=360
We move all terms to the left:
5a+(a+80)+(2a+200)-(360)=0
We get rid of parentheses
5a+a+2a+80+200-360=0
We add all the numbers together, and all the variables
8a-80=0
We move all terms containing a to the left, all other terms to the right
8a=80
a=80/8
a=10
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