2a+7+a=28

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Solution for 2a+7+a=28 equation: 



2a+7+a=28

We move all terms to the left:

2a+7+a-(28)=0

We add all the numbers together, and all the variables

3a-21=0

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

3a=21

a=21/3

a=7

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