3(6a+9)=21

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Solution for 3(6a+9)=21 equation: 



3(6a+9)=21

We move all terms to the left:

3(6a+9)-(21)=0

We multiply parentheses

18a+27-21=0

We add all the numbers together, and all the variables

18a+6=0

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

18a=-6

a=-6/18

a=-1/3

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