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-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
16 = x/(x-4) // - x/(x-4)
16-(x/(x-4)) = 0
(-1*x)/(x-4)+16 = 0
(-1*x)/(x-4)+(16*(x-4))/(x-4) = 0
16*(x-4)-1*x = 0
15*x-64 = 0
(15*x-64)/(x-4) = 0
(15*x-64)/(x-4) = 0 // * x-4
15*x-64 = 0
15*x-64 = 0 // + 64
15*x = 64 // : 15
x = 64/15
x = 64/15
| 2x+116=-6x+8-x | | z-5/7=-3 | | (2x^2)/8=81 | | 4x^2+4x-63=0 | | 4(4x-3)-2(3x-5)=4x+13 | | 2x^2/8 | | 32=-3x/6 | | 4cos^2x+2sinx-1=0 | | -30x^2+700x+2100=0 | | A/7-11=17 | | 7x+5=-11+3x | | 4cos^2x+sinx-1=0 | | f(x)=-6x^2+2x+8 | | -3x^2+3x-1=0 | | 1175=20x+35y | | -42=6(v+2) | | 5x-6y=-28 | | (7x+8)+(-8+4)= | | 3/5b=7/5 | | x^2+4x-12 =0 | | 11/4-2/3 | | 3x-(5x-21)=6x+(9-4x) | | =ln(11-2x) | | 2=8/6x | | 4x^2+8x+16y^2-32Y=44 | | 4x^3-150x^2+900x=0 | | 13/14x=286 | | 4a+b=175 | | X^2+2x+y^2-10y=55 | | x^2-2x-35 =0 | | -(x)-6=5 | | y=3x^2-11x+24 |