9a-20+9a+56=180

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Solution for 9a-20+9a+56=180 equation: 



9a-20+9a+56=180

We move all terms to the left:

9a-20+9a+56-(180)=0

We add all the numbers together, and all the variables

18a-144=0

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

18a=144

a=144/18

a=8

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