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a+(a+15)+(a+15)=180
We move all terms to the left:
a+(a+15)+(a+15)-(180)=0
We get rid of parentheses
a+a+a+15+15-180=0
We add all the numbers together, and all the variables
3a-150=0
We move all terms containing a to the left, all other terms to the right
3a=150
a=150/3
a=50
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