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 = 5/n-9 // - 5/n-9
6/n-(5/n)+9 = 0
6/n-5*n^-1+9 = 0
1*n^-1 = -9 // : 1
n^-1 = -9
-1 < 0
1/(n^1) = -9 // * n^1
1 = -9*n^1 // : -9
-1/9 = n^1
n = -1/9
n = -1/9
| 2x+24=4x^2-2x | | 5a+8=12 | | z/4+18=20 | | 20y-2x=90 | | x^2-7x-21=3x+3 | | 8c+7=-345 | | f(x)=x^2+7x+15 | | 2x-40=4x+12 | | y=x^2+0x+22 | | x^2-12x+42=10 | | M+87=13 | | a=2g+c | | 3(6x+2)=-5(1-7x) | | -2x+11=3(x+5)+8x | | 2r+8=96 | | 6x+4=x+17 | | u/3-8=3 | | x^2-11x-25=-6x-1 | | y=38x+44 | | -2y+6=11y-2 | | v/2-7=3 | | 8b+8+3b-9= | | R-19=8 | | 38x+6y=280 | | (X/6)-(x-8)=5/12 | | 2x-x+7=4x+2 | | x^3=5cos^2x | | 5x+3=11x-9 | | 9a^4-4b^4=0 | | 3y=5(y-4) | | -10y=-10+4x | | 4c=-136 |