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)
40 = 200/x // - 200/x
40-(200/x) = 0
40-200*x^-1 = 0
-200*x^-1 = -40 // : -200
x^-1 = 1/5
-1 < 0
1/(x^1) = 1/5 // * x^1
1 = 1/5*x^1 // : 1/5
5 = x^1
x = 5
x = 5
| -97-2x=3x+48 | | 45x-8=12 | | 82=(3x+2)+x | | 13x+9+15x-1=180 | | f(x)=15(0)+4 | | 5m/2-30=5 | | x+16=yforx | | -7u+21=7(u-5) | | 3x-19=-x-2(1-2x) | | X+(x-45)+(x-45)+(x-45)=540 | | (x+9)+(x+2)+(x-7)=180 | | 5x^3y+5x^4-15x^4y=0 | | 6y+2+(2/3)-y | | 1/9y+1/3=-1/18 | | -(7t+1)-(-6t-6)=-1 | | x-16=102 | | 8=-5x+x | | 11x-27=11x+7 | | 15=-5a+2a | | 6z+14=5z+2 | | 14x=4x+190 | | 8-3p-4=2p | | 3-81/x=12 | | 44.4/1917000 | | 3/4(16x-4)=21 | | 15=-5a+a | | 5/18a-27=-7 | | 4(-5+x)=30-6x | | 6-1.5x=-12+x | | F(c)=4x-5 | | -3a+5a=6 | | 3.7w=-11.1 |