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)
1/5-((6/5)*x) = 4/x // - 4/x
1/5-((6/5)*x)-(4/x) = 0
(-6/5)*x-4*x^-1+1/5 = 0
1/5*x^0-6/5*x^1-4*x^-1 = 0
(1/5*x^1-6/5*x^2-4*x^0)/(x^1) = 0 // * x^2
x^1*(1/5*x^1-6/5*x^2-4*x^0) = 0
x^1
(-6/5)*x^2+(1/5)*x-4 = 0
(-6/5)*x^2+(1/5)*x-4 = 0
DELTA = (1/5)^2-(-4*4*(-6/5))
DELTA = -479/25
DELTA < 0
x in { }
x belongs to the empty set
| 3x+15=58x | | 1/5-6/5x=4/x | | 1/2x-7=1/4x-2 | | 3x+4y+mz=7 | | 9.8-(16r)=-15.7-(r) | | 9sin(2x)=9cos(x) | | 6x(3+1)+4= | | 10+6n=4n-4 | | 4+(x+3)=1 | | 2x=(420/6) | | (3x+2)5(4+2x)=10(3x+4)-8 | | .45p=p-5.5 | | 2.5p+2.25=8.5p+1.10 | | -7t-t=3x | | -12+n=6-8n | | -7t-q=3x(t) | | .5(3x+91)=x+3 | | -7t-q=3x | | N/-3-7=5 | | -7/16w-(26)=-19 | | (x+2)=-10 | | -1/4/-3/5= | | 0.05x-0.01y=0.1 | | 5x/2-7=2x-7/6 | | 2(3x+5)=6x+12 | | (-2x-2)=18 | | -9*-1-8x=25 | | (4-8n)=20 | | (-2x-2)=12 | | 16=3x-5 | | y(x)=1/2e^1/3x | | -9y-8=6y+22 |