2a+a+2a+a-a=20

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



2a+a+2a+a-a=20

We move all terms to the left:

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

We add all the numbers together, and all the variables

5a-20=0

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

5a=20

a=20/5

a=4

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