21=a-4*3

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Solution for 21=a-4*3 equation: 



21=a-4*3

We move all terms to the left:

21-(a-4*3)=0

We add all the numbers together, and all the variables

-(a-12)+21=0

We get rid of parentheses

-a+12+21=0

We add all the numbers together, and all the variables

-1a+33=0

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

-a=-33

a=-33/-1

a=+33

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