2a+a+40+a-20=180

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Solution for 2a+a+40+a-20=180 equation: 



2a+a+40+a-20=180

We move all terms to the left:

2a+a+40+a-20-(180)=0

We add all the numbers together, and all the variables

4a-160=0

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

4a=160

a=160/4

a=40

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