a+20+a+10=180

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Solution for a+20+a+10=180 equation: 



a+20+a+10=180

We move all terms to the left:

a+20+a+10-(180)=0

We add all the numbers together, and all the variables

2a-150=0

We move all terms containing a to the left, all other terms to the right

2a=150

a=150/2

a=75

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