30+2a-3+a-18=180

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Solution for 30+2a-3+a-18=180 equation: 



30+2a-3+a-18=180

We move all terms to the left:

30+2a-3+a-18-(180)=0

We add all the numbers together, and all the variables

3a-171=0

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

3a=171

a=171/3

a=57

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