3a-a=28

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Solution for 3a-a=28 equation: 



3a-a=28

We move all terms to the left:

3a-a-(28)=0

We add all the numbers together, and all the variables

2a-28=0

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

2a=28

a=28/2

a=14

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