a+(a-9)+(a+38)=180

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Solution for a+(a-9)+(a+38)=180 equation: 



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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