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a+(a-9)+(a+38)=180
We move all terms to the left:
a+(a-9)+(a+38)-(180)=0
We get rid of parentheses
a+a+a-9+38-180=0
We add all the numbers together, and all the variables
3a-151=0
We move all terms containing a to the left, all other terms to the right
3a=151
a=151/3
a=50+1/3
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