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)
3/x = x/3 // - x/3
3/x-(x/3) = 0
3*x^-1-1/3*x^1 = 0
(3*x^0-1/3*x^2)/(x^1) = 0 // * x^2
x^1*(3*x^0-1/3*x^2) = 0
x^1
(-1/3)*x^2+3 = 0
(-1/3)*x^2+3 = 0
DELTA = 0^2-(3*4*(-1/3))
DELTA = 4
DELTA > 0
x = (4^(1/2)+0)/(2*(-1/3)) or x = (0-4^(1/2))/(2*(-1/3))
x = -3 or x = 3
x in { -3, 3}
x in { -3, 3 }
| 40x+15y=3075 | | 6x+43=19x+13 | | h(x)=x(x-3) | | f(x)=3(x-2)(x+1) | | s^2+8s+12= | | x^5=243 | | g(x)=-(x-2)(x+6) | | 5t-10t^2= | | x^5-243=0 | | g(x)=-(x-2) | | -2-2u=-17+3u | | -3s^2+9s= | | f(x)=(x-3)(x+8) | | (10*16-176-26)/(20+3) | | 3+10/2=x | | 4x+3y=1320 | | f(x)=-4+1 | | 2(2x-10)+2x=400 | | 6(75)+100=529 | | 4x+20x^2= | | 23x-5-15x+3=23x-4-15x+17 | | X+9=56 | | x-1/6x^3=0 | | x^2-10x-71=0 | | x^2-26x-144=0 | | a/2-3=11 | | 2(-x)+1=10 | | 6x+3=135 | | 90-2x=25x+15 | | 12-14x=0 | | 3x/5=9/4 | | 25/40=5/x |