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)
42/6 = 56/h // - 56/h
42/6-(56/h) = 0
42/6-56*h^-1 = 0
-56*h^-1 = -7 // : -56
h^-1 = 1/8
-1 < 0
1/(h^1) = 1/8 // * h^1
1 = 1/8*h^1 // : 1/8
8 = h^1
h = 8
h = 8
| 260+65x=1885 | | -3640+3640=x | | x+x(.07)=6.66 | | 2x-4-8=0 | | log[4](2x-8)=3 | | 4y^2+28y+9=0 | | -3640+180x=36 | | 3d=9d-18 | | 5z-2(z-9)=3+4z | | 5x+18x+4x=8 | | 7x-14y=70 | | 0.5(4y-6x)= | | 5x-18x-4x=8 | | x^2-15=40 | | 4x*12=-8 | | 7280-80x=-3640+180x | | 4x^2+2=110 | | 4.32-12.751=o | | 7y+24-3y=-12 | | 2x+2y+22=180 | | 2/2z=-6 | | -4(x+3)-7=-55 | | Z=my/x | | f(-2)=8x-9 | | X-X(0.06225)=1501 | | 9(x+2)=9(x+11) | | -2(2x+5)=4+5x-5 | | -2.5b=20.2 | | 7/6x=3 | | 7(n-2)=2(n+3)+3(n-4) | | 3(x+5)-x=3(6)+1 | | -6.8+19.5=l |