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(a+10)+a+2a=360
We move all terms to the left:
(a+10)+a+2a-(360)=0
We add all the numbers together, and all the variables
3a+(a+10)-360=0
We get rid of parentheses
3a+a+10-360=0
We add all the numbers together, and all the variables
4a-350=0
We move all terms containing a to the left, all other terms to the right
4a=350
a=350/4
a=87+1/2
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