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)
6/x = (4/6)*x // - (4/6)*x
6/x-((4/6)*x) = 0
(-2/3)*x+6/x = 0
6*x^-1-2/3*x^1 = 0
(6*x^0-2/3*x^2)/(x^1) = 0 // * x^2
x^1*(6*x^0-2/3*x^2) = 0
x^1
(-2/3)*x^2+6 = 0
(-2/3)*x^2+6 = 0
DELTA = 0^2-(4*6*(-2/3))
DELTA = 16
DELTA > 0
x = (16^(1/2)+0)/(2*(-2/3)) or x = (0-16^(1/2))/(2*(-2/3))
x = -3 or x = 3
x in { -3, 3}
x in { -3, 3 }
| 3.9(1.6x-0.6)=-0.4(4.2x-2.07) | | C=2+R | | 4y+2x+8-5y-5+3x= | | cos(2pix)=4x^2-6x-1 | | -10+n=-53 | | U+8=-72 | | y=-10(10)-4 | | 38/100=x/81 | | 3x+-5=2x+7 | | 5.25x+N=29 | | Ax-x+7=0 | | y=(x-a)(x-b) | | -2.13+[-2.8]= | | 3-7n+2n=4-96 | | -0.7y+13.5=7y+31.98 | | 4x+12=7x-24 | | 3x+2x^2-119=0 | | -2-x/5=4 | | 1.25x-y=-9 | | 11c-9c-2= | | 2(u+1)+4=14 | | r/-7/9=6/5 | | y=-10(-9)-4 | | 3x+3y-x+2y= | | mx+13=37 | | 5/5=3/4 | | -1.2b+4=22 | | 4x+4x+4x+4x=180 | | y=-10(-8)-4 | | X-2/3=2.25 | | 2x+2x+7x+7x=180 | | (5x+4y)dx+(4x-y)dy=0 |