If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
x^3 = 0
(x^5)/(x^3) <= 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
(x^5)/(x^3) <= 0
(x^5)/(x^3) <= 0
1*x^2 <= 0
1*x^2 <= 0 // : 1
x^2 <= 0/1
x^2 <= 0
x in <0:0>
x in (-oo:0) U (0:+oo)
ln((x^5)/(x^3)) = 0
ln((x^5)/(x^3)) = ln(e^0)
(x^5)/(x^3) = e^0
(x^5)/(x^3)-e^0 = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
| H=6x(40-x) | | 16x^9-9x^7+20x^6= | | 18/3=x/4 | | 18/3=x/$ | | 2(w-7)=3w | | 14p+(-11p)-(-14)=2 | | p(x)=x^3+7x^2+17x-25 | | H=6t(40-t) | | 12k=-6(k+9) | | 5-(3x-6)= | | 6f+30+8=2f | | 22/24 | | 2x+4y+2=5 | | 5x-12=-7x | | 10+12y=2y-40 | | -r-(-9r)-20=-4 | | 2(x-1)-6x=26 | | 15/30 | | 19h-9h-9h+2=18 | | 25+30.76=3+5 | | 20-x=4x+5 | | 2g+3g-g-g=9 | | -1/5(×-25)=7 | | 6m-15=3m-36 | | 3-x=5x-9 | | 14u-14u+u=5 | | (70-4x)+(18x-8)=90 | | n/2-4=12 | | (-2/7)3 | | 26/42 | | 60=-2x+-8 | | 2x+6x-10=62 |