2a+3a+6=21

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Solution for 2a+3a+6=21 equation: 



2a+3a+6=21

We move all terms to the left:

2a+3a+6-(21)=0

We add all the numbers together, and all the variables

5a-15=0

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

5a=15

a=15/5

a=3

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