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(5a+30)+5a+(2a-90)=360
We move all terms to the left:
(5a+30)+5a+(2a-90)-(360)=0
We add all the numbers together, and all the variables
5a+(5a+30)+(2a-90)-360=0
We get rid of parentheses
5a+5a+2a+30-90-360=0
We add all the numbers together, and all the variables
12a-420=0
We move all terms containing a to the left, all other terms to the right
12a=420
a=420/12
a=35
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