If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
3*x^4 = 0
3*x^4 = 0
3*x^4 = 0
3*x^4 = 0 // : 3
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(36*x^3)/(3*x^4) = 0
12*x^-1 = 0 // : 12
x^-1 = 0
x należy do O
x belongs to the empty set
| 7x-5=-49 | | 2lnx-6=20 | | 9m-3(m+6)=2m+1 | | x-2+x-2=180 | | -2-.25w=-5 | | -12x-131=58-3x | | 3x-2/5=7x-1/4 | | 5/x+1=-4 | | 7(2x-2)-5x=3x+6 | | y=11+x | | 36x^3/3x^4 | | x+X(.08625)=625 | | (x-7/5)=1-(x/7) | | x+x-2=180 | | 2b+8=48 | | 2.1x=8.7 | | -43-4x=11-7x | | x-7+x-8=180 | | 4x/5a=c | | 1x-4(1/4x-3)=12 | | x+8=3x+15 | | -10x+10=12w-12 | | 20-x=-4x | | 8x+12-5(x+2)=8 | | x-8+x-10=180 | | 7x-89=-x+87 | | G-3=7/2 | | 3x+22=8 | | x-(7/5)=1-(x/7) | | 5/9*48=x | | 116+74+5x+4x=360 | | -4+4x=x-4 |