a-21+a-15+2a=180

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Solution for a-21+a-15+2a=180 equation: 



a-21+a-15+2a=180

We move all terms to the left:

a-21+a-15+2a-(180)=0

We add all the numbers together, and all the variables

4a-216=0

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

4a=216

a=216/4

a=54

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