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
5*x = 0
x = 0
x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
2/5-(3/x) = 1/(5*x) // - 1/(5*x)
2/5-(3/x)-(1/(5*x)) = 0
(-1/5)*x^-1-3*x^-1+2/5 = 0
-16/5*x^-1 = -2/5 // : -16/5
x^-1 = 1/8
-1 < 0
1/(x^1) = 1/8 // * x^1
1 = 1/8*x^1 // : 1/8
8 = x^1
x = 8
x = 8
| 8x^2-19=2x^2-x | | 65+5= | | 8x^2+5-805=0 | | 2.86/5=x/4 | | 4/6=x/4 | | 4.86/7=x/4 | | X^2+13=18x | | 12/5=x | | 4x^2-12x+16=0 | | a^2c-3bc-a^2+3b=0 | | 1.86/3=x/4 | | 36+15x=17d | | 5.5x=60*24.5 | | 5x/3-2x/9=8 | | 3/5=x/4 | | 33=-4x+7 | | 2.71/5=x/4 | | 5.71/7=x/4 | | 3.43/5=x/4 | | -1-3=9-8t | | y+3x=20 | | x/3=16/12 | | 5x-14=70-3x | | 3g+4=6g+7 | | x^2+15x-169=0 | | p^2-6/5+9/25=0 | | -27+-1+7= | | g^2-2/3g+1/9=0 | | 0.25=1200 | | 7y=5x-8 | | 2x^2+y=3x+6 | | 58=8+9m^2 |