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)
20/x = 4/2 // - 4/2
20/x-(4/2) = 0
20/x-2 = 0
20*x^-1 = 2 // : 20
x^-1 = 1/10
-1 < 0
1/(x^1) = 1/10 // * x^1
1 = 1/10*x^1 // : 1/10
10 = x^1
x = 10
x = 10
| 5x-8x+8=x-7+15 | | y^4-7y^2-18=0 | | 12(x+4)-6x=6(x+9) | | 2x^4+3x^2+7=0 | | 14=4(x-1)-(x-9) | | 4(3x-3)-2=4(x-4)+58 | | 4(3x-3)-2=4(x-4)+55 | | 16t^2-24t+4=0 | | -1n+5=9n | | 2x-(3x+9)=7x-17 | | -2-8+(-9)-5= | | 2x-7x+8=x-3+11 | | x^2+4+8=0 | | [2x-3]=4x-1 | | 31x+20=12x-37 | | =e^2x | | (8i)(4i)(-9i)=0 | | x-8/3=-2 | | 12.6x-2.3x=-206 | | -5x-13x=108 | | -4-y=-9 | | 8y+12x=-6 | | 2[x-(4x+13)+7]=2(x+6) | | x/12=15/9 | | 16t^2-24t-6=0 | | y=ln(sin(2x)) | | pv=kt | | -2-y=-9 | | 4z-9=5z-4 | | 1.23x=4.192-2.77x | | -8+y=10 | | 5/6=x/42 |