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)
15/x = 2/4 // - 2/4
15/x-(2/4) = 0
15/x-1/2 = 0
15*x^-1 = 1/2 // : 15
x^-1 = 1/30
-1 < 0
1/(x^1) = 1/30 // * x^1
1 = 1/30*x^1 // : 1/30
30 = x^1
x = 30
x = 30
| X^2-4x=12x | | 5.5x=3.2(2x+1) | | T-5.4=14.2 | | 1x+1x=9x+9x | | 5(x+8)=35 | | 82=3x-29 | | 1n+1x=1a-1v | | x+y=3302x+3y=140 | | -4n^2-3n+6=0 | | 7!/3! | | 9a+102= | | 2x^2+10x-5(.5x^2)= | | 5c+9=4c | | 2a-28=12a | | 3x^2-0.5x-56.5=0 | | -6+7j=9j | | 11u-2u=81 | | 3x^2-0.5x=56.5 | | 1240=2/3x-300 | | 3x+4y=470 | | 9x-1=6x+58 | | 3x^2-0.5x-104.5=0 | | -3(4s-2)-6=3(6s+3)-4 | | 1/2x3/10 | | 3-[-c-24]=-3c-24 | | 4n+3(n-5)+3= | | 2x^2+10x-5= | | -9y+8-3y=5-12y+13 | | -3(2s-2)-6=-3(9s+4)-4 | | Cos28=10/x | | 3x^2-0.5x-80.5=0 | | 0.6x+0.75y=5.85 |