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)
4/9 = 936/n // - 936/n
4/9-(936/n) = 0
4/9-936*n^-1 = 0
-936*n^-1 = -4/9 // : -936
n^-1 = 1/2106
-1 < 0
1/(n^1) = 1/2106 // * n^1
1 = 1/2106*n^1 // : 1/2106
2106 = n^1
n = 2106
n = 2106
| Y-.5=sqrt(4-(x^2-.75x-.25)) | | 30/18=n/21 | | 30/18=21/n | | 30/6=15/n | | 9=2x^2+2x+1 | | 14/4=n/10 | | 2a-1/2=23/3 | | (5x^2-7x-4)+(2x^2-3x+5)-(x^2-4x-3)= | | t^2-8=7t | | 63a-7/9a^-3 | | 3x^2+19=-30 | | 74j=100 | | 74=100 | | 3x^2+79x=-30 | | 74j=257-63j | | X/7=60 | | 6x^2-7x=3x-4 | | 10/100x100 | | 2(u-2)-4u=-10 | | Log[4](2x+8)=log[4](6x-12) | | C=52.5-1.5y | | 9x-(6x+3)=4x-27 | | 3x+x+x+20=125 | | x+3y-z=-7 | | 4y+6-1=0 | | 12(x+4)=21(x+1) | | 4y+6-1=5 | | x+3x+20=125 | | 6(x+8)=17(2x-2) | | -x-9y=4 | | 4+4x=180 | | 1-2y+y^2+2xy=0 |