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 = 12/28 // - 12/28
6/n-(12/28) = 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
| 6b+3=-51 | | 20/15=n/3 | | 5x-3(4x-8)=-11 | | -2(1-3x)=22-3(x-13) | | n/6=16/2 | | 32-5y=2 | | 1/2(x-14)=22 | | 5/8=n/24 | | -2(1-3x)=22-(x-13) | | 12/n=3/4 | | x=8/sin55 | | -18.5=-9+5.5(r-7) | | (((5y^8)(u^2))^(1/2))(((15y^2)(u^5))^(1/2)) | | 16/20=8/n | | a^2-2a+144=192 | | 2(7-8x)=32-10x | | 2x=(360/4)-20 | | 18/60=n/20 | | 7n-19=-5n+7 | | X-6x=-20 | | 2x^-3y^2/3x^-3y^3*3x^0 | | r/5=14 | | -8.5s-2+2.5s=24.5 | | 2=1/2(3x−10) | | n/24=15/40 | | 2 = 1/2(3x−10) | | 28/35=4/n | | 12+x+5x=10x+4 | | -5(7n+6)=11+6n | | 2/3×t=5 | | (3x+4)(3x+4)=256 | | -5(6+4)-3= |