9(1+3a)=21

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Solution for 9(1+3a)=21 equation: 



9(1+3a)=21

We move all terms to the left:

9(1+3a)-(21)=0

We add all the numbers together, and all the variables

9(3a+1)-21=0

We multiply parentheses

27a+9-21=0

We add all the numbers together, and all the variables

27a-12=0

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

27a=12

a=12/27

a=4/9

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