9(2a+1)=21a

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Solution for 9(2a+1)=21a equation: 



9(2a+1)=21a

We move all terms to the left:

9(2a+1)-(21a)=0

We add all the numbers together, and all the variables

-21a+9(2a+1)=0

We multiply parentheses

-21a+18a+9=0

We add all the numbers together, and all the variables

-3a+9=0

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

-3a=-9

a=-9/-3

a=+3

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