a+20+a+16+a+13=180

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Solution for a+20+a+16+a+13=180 equation: 



a+20+a+16+a+13=180

We move all terms to the left:

a+20+a+16+a+13-(180)=0

We add all the numbers together, and all the variables

3a-131=0

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

3a=131

a=131/3

a=43+2/3

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