If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = 3/7 // - 3/7
6/n-(3/7) = 0
6/n-3/7 = 0
6*n^-1 = 3/7 // : 6
n^-1 = 1/14
-1 < 0
1/(n^1) = 1/14 // * n^1
1 = 1/14*n^1 // : 1/14
14 = n^1
n = 14
n = 14
| 3x^2-3kx+3=0 | | 4r^2-r+2=0 | | 16.2r=32.4 | | 42y^2+41y-8=0 | | -t/18-180 | | 5t^2-14t+9=0 | | W^2=2W+35 | | 4/15x3/8 | | z=y/20 | | 2x-(5x+2)=2+(2x+7) | | 4w^2+9w+9=0 | | 4x+50=310 | | m*m-9=0 | | 28/12=14/28 | | -11x^2+121x=0 | | 2n*n+5n-3=0 | | Y=0.5(x-2)(x-6) | | 3n+2[-2n-1]= | | ln(400/A)/3=ln(2000/A)/13 | | 3/5-6=-2/5(e-10)-7 | | 25/-26/3 | | 3n*n-4n-4=0 | | ln(400/A)/3=ln(2000/A)/10 | | -10j=0 | | d/5=-1 | | x=25/2-26/3 | | -y-3[-3y+5]= | | 1/5=e^3K/e^10K | | an=2n/n | | b-4=-8 | | 3n*n-8n-3=0 | | 7p-5=11+4p |