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)
3/4 = 9/n // - 9/n
3/4-(9/n) = 0
3/4-9*n^-1 = 0
-9*n^-1 = -3/4 // : -9
n^-1 = 1/12
-1 < 0
1/(n^1) = 1/12 // * n^1
1 = 1/12*n^1 // : 1/12
12 = n^1
n = 12
n = 12
| 5(-3)-4=8(-3)+5 | | -5x+8(2x-6)= | | 4ln(6x+3)-2=6 | | a-45=91 | | m-7=-14 | | b-9=-9 | | m+3=11 | | 6+d=13 | | w-5=-4 | | 3/2(y+4)=20-y/2 | | 0.3x=1.5x | | t-8=-5 | | -1/11*33 | | 14=w+7 | | 5+n=6 | | b/7=-3 | | -4+a=-10 | | -5x+16x-48= | | 33*-1/11 | | 24.8=t+5.1 | | y+54=80 | | 5w+w+6w= | | m/-2=-6 | | m+10=16 | | 33x-1/11 | | a/-7=-4 | | 3+n=-9 | | X/7-3=5 | | 25v=100 | | -6y+8=-7y+1 | | -6w=-24 | | k+1=-3 |