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)
24/28 = 6/n // - 6/n
24/28-(6/n) = 0
24/28-6*n^-1 = 0
-6*n^-1 = -6/7 // : -6
n^-1 = 1/7
-1 < 0
1/(n^1) = 1/7 // * n^1
1 = 1/7*n^1 // : 1/7
7 = n^1
n = 7
n = 7
| 23+(x+30)=90 | | Ix^2+x+2i=0 | | 4x^2+6x+3=-2x | | 9c-7=7c-11 | | 4(k-3)+1=32 | | 7(4x-2)=49 | | x^2+3x^2=64 | | 12-2x=7-12 | | -5(x+3)-43=7-30 | | W-2.5=0.7 | | 20/30=10/n | | -9(x-18)=144 | | 6=2j+2 | | -2g-16=3(h-2) | | 2arccos(x/7) | | 3(-3y+-10)=-30 | | x+5+12=8*x | | 3y+6-4=32 | | x^2+5=40 | | 15x+9x=25x | | 7/3x-2=28-4x | | 1/2=n/38 | | 0.5r-3.8=5.6 | | 4(5x+3)=26 | | 6(2y-1)=13g | | 5x^2+15=13x+7 | | -2=2u-8 | | x+5+12=8x | | -4x+9y-12=0 | | 2.5x+0.5x=3x+7+3.5x | | 7600=1.2x | | 57y=8(7y+55) |