a-a+3a-a=4

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Solution for a-a+3a-a=4 equation: 



a-a+3a-a=4

We move all terms to the left:

a-a+3a-a-(4)=0

We add all the numbers together, and all the variables

2a-4=0

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

2a=4

a=4/2

a=2

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