20n+9)/n=21

Solution for 20n+9)/n=21 equation:

20n+9)/n=21

We move all terms to the left:

20n+9)/n-(21)=0


Domain of the equation: n-21!=0

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

n!=21

n∈R


We multiply all the terms by the denominator


20n*n-21+9)=0

We add all the numbers together, and all the variables

20n*n=0

Wy multiply elements

20n^2=0

a = 20; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·20·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$n=\frac{-b}{2a}=\frac{0}{40}=0$