3/a-4=21/a+1

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Solution for 3/a-4=21/a+1 equation: 



3/a-4=21/a+1

We move all terms to the left:

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



Domain of the equation: a!=0

a∈R





Domain of the equation: a+1)!=0

a∈R



We get rid of parentheses

3/a-21/a-1-4=0

We multiply all the terms by the denominator


-1*a-4*a+3-21=0

We add all the numbers together, and all the variables

-5a-18=0

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

-5a=18

a=18/-5

a=-3+3/5

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