2a+4a-a-a=20

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



2a+4a-a-a=20

We move all terms to the left:

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

We add all the numbers together, and all the variables

4a-20=0

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

4a=20

a=20/4

a=5

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