80+2a+3a=180

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Solution for 80+2a+3a=180 equation: 



80+2a+3a=180

We move all terms to the left:

80+2a+3a-(180)=0

We add all the numbers together, and all the variables

5a-100=0

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

5a=100

a=100/5

a=20

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