21=a/9

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Solution for 21=a/9 equation: 



21=a/9

We move all terms to the left:

21-(a/9)=0

We add all the numbers together, and all the variables

-(+a/9)+21=0

We get rid of parentheses

-a/9+21=0

We multiply all the terms by the denominator


-a+21*9=0

We add all the numbers together, and all the variables

-1a+189=0

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

-a=-189

a=-189/-1

a=+189

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