21=a/2+9

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Solution for 21=a/2+9 equation: 



21=a/2+9

We move all terms to the left:

21-(a/2+9)=0

We get rid of parentheses

-a/2-9+21=0

We multiply all the terms by the denominator


-a-9*2+21*2=0

We add all the numbers together, and all the variables

-1a+24=0

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

-a=-24

a=-24/-1

a=+24

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