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+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
((1/3)*(x+3)^-2)/3 = 0
1/3/(3*(x+3)^2) = 0
x belongs to the empty set
| 4(2c-3)=5(c-2) | | 19+10n=8n-13 | | 14-3^2+(3+12)+72/6 | | -8/7/4 | | x+30=55 | | 21.6=6c-9 | | 4x+12=-10x-2 | | 5e-5=11 | | x-10/25=-25 | | K+9-3k=37 | | 3p=13.5 | | -4-x=-5 | | -4d+8-d=-2 | | 5/3a+8=-2/-1 | | 2xsquared-6x=10 | | 3h/4+15=45 | | 4x+1+3x+5=160 | | a+5=21 | | 33=d+6-4d | | 3h+15=45 | | -1+8a+3=10 | | 11x-12y=1 | | 2x+200=5 | | Y=85+.5Y(-40+0.25Y)+85+60 | | 12x+15+6x=69 | | 3x^3+18x=0 | | 6-3x=5x-10x-6 | | -(3x)+6=2x+1 | | 27-12x+32=11 | | x-4+x+4=2(x+6)-3(x-7) | | 66-3x=5x-10x-6 | | x=921.54+y |