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^2)/3 = 0
(3*x^2)/3 = 0
(3*x^2)/3 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/((3*x^2)/3) = 0
1*x^-2 = 0 // : 1
x^-2 = 0
x należy do O
x belongs to the empty set
| -2/3-12 | | (2+-4)=8 | | 4.25+1.5r=m | | ln(x+5)-ln(x+1)=ln(x-2) | | 3/21-14/21 | | 14-2(3p+1)=6(4+6) | | (X-2)+6x=180 | | x^2+10x=40 | | 1.5x+7.4=1.8x+-6.9 | | 5a+2b=29 | | 10x1000/1 | | 6x-14/814 | | 12+12+5.5+5.5+x+x= | | 2ln(x-1)-ln(-4x+16)=0 | | -7x-5=33 | | 2/5/1/4=x/1 | | 35/x=460 | | 48x^6+140x^5-444x^4-1439x^3-370x^2+390x+100=0 | | 40s-13=51 | | 5+-3x-6=-24 | | -x-6-5x=14-2x | | 8/3-1/5 | | 6+3lnx=21 | | 9/4-5/10 | | 6/x-1/4=7/2x | | 2ln(x+1)=ln(4x+25) | | 7t^4(t-t^2+4t^3)= | | (3/4)*x-11=1 | | 15/7-1/14 | | 4x^2-16x-3y+28=0 | | 3.6/8=m/7 | | 9y-8=8y-6 |