a-30+2a+30=180

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Solution for a-30+2a+30=180 equation: 



a-30+2a+30=180

We move all terms to the left:

a-30+2a+30-(180)=0

We add all the numbers together, and all the variables

3a-180=0

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

3a=180

a=180/3

a=60

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