a+2a+2a-4a=20

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Solution for a+2a+2a-4a=20 equation: 



a+2a+2a-4a=20

We move all terms to the left:

a+2a+2a-4a-(20)=0

We add all the numbers together, and all the variables

a-20=0

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

a=20

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