21=6+a/2

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Solution for 21=6+a/2 equation: 



21=6+a/2

We move all terms to the left:

21-(6+a/2)=0

We add all the numbers together, and all the variables

-(a/2+6)+21=0

We get rid of parentheses

-a/2-6+21=0

We multiply all the terms by the denominator


-a-6*2+21*2=0

We add all the numbers together, and all the variables

-1a+30=0

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

-a=-30

a=-30/-1

a=+30

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