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 = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
1/(3*x)-(2*x)-4 = 0
1/(3*x)-2*x-4 = 0
1/3*x^-1-2*x^1-4*x^0 = 0
(1/3*x^0-2*x^2-4*x^1)/(x^1) = 0 // * x^2
x^1*(1/3*x^0-2*x^2-4*x^1) = 0
x^1
1/3-2*x^2-4*x = 0
1/3-2*x^2-4*x = 0
DELTA = (-4)^2-(-2*4*(1/3))
DELTA = 56/3
DELTA > 0
x = ((56/3)^(1/2)+4)/(-2*2) or x = (4-(56/3)^(1/2))/(-2*2)
x = ((56/3)^(1/2)+4)/(-4) or x = (4-(56/3)^(1/2))/(-4)
x in { ((56/3)^(1/2)+4)/(-4), (4-(56/3)^(1/2))/(-4)}
x in { ((56/3)^(1/2)+4)/(-4), (4-(56/3)^(1/2))/(-4) }
| 1/3x-2x-4 | | 1k-101=3 | | X+X^2=2.69 | | 20-8f=-3f-20 | | x-4=-4x-4 | | X^2-2015x=200 | | Log(x^2-2015x-100)=2 | | -2x+5=6x-7 | | 121x^2-44x=275x-100 | | y=3t-2 | | X^2-2015x=0 | | 6(x+6)=3(x+18) | | 2(x-5)=54-6x | | (5x+3)2=4(2x-3)2 | | 5(x-2)=25-2x | | 10x+25(30-x)=420 | | x+8=7x+14 | | 8(r+5)-9(r+3)=5 | | 2x-2=58-10x | | 8x+5=5x+32 | | 5x+10(21-x)=165 | | -6(j+8)=-4j-48 | | 6x-6=72-7x | | 8x+8.5(7000-x)=520 | | 2-7y^2-3y=0 | | 5a-2=43 | | 3c+c-8+10c= | | v=2t-t-6 | | 0.12x+.09(900-x)=96 | | Y/9-2/5=1/3 | | 6x+15-2x-12= | | 3/x=4/3x-10/3 |