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)
20/10 = 30/x // - 30/x
20/10-(30/x) = 0
20/10-30*x^-1 = 0
-30*x^-1 = -2 // : -30
x^-1 = 1/15
-1 < 0
1/(x^1) = 1/15 // * x^1
1 = 1/15*x^1 // : 1/15
15 = x^1
x = 15
x = 15
| 3x+41=59 | | 20x^2=24-17x | | 3(x+2)-4x=7 | | 8v=-9+7v | | 2x=(10/2) | | 3/4(2x-6)=5/6 | | 2-9n=-34 | | 23=5+3u | | 5n=45.6 | | f(3)-9=5(9)+4(3) | | 13x+7=-6 | | Cos(x+10)=-.44 | | 4x^2-54x+50=0 | | 180=15+64+x | | x=1/2x-2=1 | | -9+b=7b+9 | | 8m-5-4m=4m+12 | | 180=x+39+25 | | 0.25x+60-x=7.4 | | 180=15+90+x | | f(3)=3x-2 | | (2x-5)/3=-5 | | 188=-4(-8n+1) | | 4(x-8)=-2x+28 | | 2/7x3x2/3 | | x+x+x+x-3+8-5=180 | | 9-3x+9=-2(4x-5) | | -4q=4q+8 | | 8/9x5/11x1/2 | | 180=20+x+40 | | 4j+10=-2-8j | | (y-6)/(y-7) |