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 = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((15*x^-3)/(-5))*x^5 = 0
-3*x^2 = 0 // : -3
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
| 18x^-3y^-4/6x^-2y^5 | | -4(1-3x)=2(8+5x) | | 3x-2(2x-5)=(x+3)-8 | | (5x^3y^5)(-3x^3y^2)= | | -(1-n)=7n-(4n+1) | | 3y^2=432 | | 16.90=s-47.99 | | 25x^2+56x+21=0 | | Xsquared=144 | | 7x+4/-3=4/5 | | y=19.95x+39.95 | | 7(6x-10)=-322 | | 16.90=s-16.90 | | -6(9-2x)=-138 | | 7(2+6x)=-448 | | 5v-2=18 | | 23-2s=1 | | -7(-4+6x)=-224 | | 18=4+2y | | 4j+2=18 | | -x+6=17 | | 10=4m-6 | | 6(-10+4x)=84 | | y=-2x^2-16x-36 | | 4n-2=2 | | 7(-x-4)=21 | | 2h-8=6 | | 4x^2=18x+18 | | 9d-9=3+3d | | (W+3)/2=-8 | | 5x8+25-(16/2+19) | | 7(9+x)=14 |