-21=1/4a

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Solution for -21=1/4a equation: 



-21=1/4a

We move all terms to the left:

-21-(1/4a)=0



Domain of the equation: 4a)!=0

a!=0/1

a!=0

a∈R



We add all the numbers together, and all the variables

-(+1/4a)-21=0

We get rid of parentheses

-1/4a-21=0

We multiply all the terms by the denominator


-21*4a-1=0

Wy multiply elements

-84a-1=0

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

-84a=1

a=1/-84

a=-1/84

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