If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
5/h = 6/18 // - 6/18
5/h-(6/18) = 0
5/h-1/3 = 0
5*h^-1 = 1/3 // : 5
h^-1 = 1/15
-1 < 0
1/(h^1) = 1/15 // * h^1
1 = 1/15*h^1 // : 1/15
15 = h^1
h = 15
h = 15
| -22+8x=14 | | 23-8x=x-4 | | 3x+4(3x-5)=10x | | 5/6-2/7 | | -7(x+4)-13=19+3 | | 14+5x=7x+2 | | 7/20+3/16 | | 7/20+3/16=x | | 9x+7=4x-13 | | m^2=41-4m | | 9x+8y=15 | | 4x-3=6x+12 | | 2(x-5)=4x-2 | | 10x=7x-15 | | 3(2+4m)-6m=2m-12 | | 5x-9y=-43 | | 5-4x-x^2=0 | | x-5a=bc | | X-4=-2x+6 | | 8x-2=30 | | 3/5/8/15 | | 2/3x+7=5 | | -8x-10=6 | | .12=.04+1.2(x-.04) | | -5x-1=-11 | | -7x-3=25 | | 1/5x=32 | | 6(x+2)+51=-3x | | x/2-8=-7 | | n/-8=6 | | 20+-18= | | -9x+2=-25 |