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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

2a-20=0

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

2a=20

a=20/2

a=10

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