2a-2a+a+a=8

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Solution for 2a-2a+a+a=8 equation: 



2a-2a+a+a=8

We move all terms to the left:

2a-2a+a+a-(8)=0

We add all the numbers together, and all the variables

2a-8=0

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

2a=8

a=8/2

a=4

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