2a-6=21

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Solution for 2a-6=21 equation: 



2a-6=21

We move all terms to the left:

2a-6-(21)=0

We add all the numbers together, and all the variables

2a-27=0

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

2a=27

a=27/2

a=13+1/2

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