13a+4a+3a=180

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Solution for 13a+4a+3a=180 equation: 



13a+4a+3a=180

We move all terms to the left:

13a+4a+3a-(180)=0

We add all the numbers together, and all the variables

20a-180=0

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

20a=180

a=180/20

a=9

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