3a-84=a

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Solution for 3a-84=a equation: 



3a-84=a

We move all terms to the left:

3a-84-(a)=0

We add all the numbers together, and all the variables

2a-84=0

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

2a=84

a=84/2

a=42

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