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 = 5/x // - 5/x
40-(5/x) = 0
40-5*x^-1 = 0
-5*x^-1 = -40 // : -5
x^-1 = 8
-1 < 0
1/(x^1) = 8 // * x^1
1 = 8*x^1 // : 8
1/8 = x^1
x = 1/8
x = 1/8
| x-(2/5*x)=72 | | 8x-7=6x+41 | | 1/2w=-1 | | 10y+7=7y | | -5x+36x=25 | | 31x=25 | | 0=-16t^2+80t+0 | | 10x^2-32x-32=0 | | 500=c(1+0.02*8) | | (4u+3)(7+u)=0 | | 4(x+1)-(3x+3)=-4 | | 10x-39=7y | | 5+4(6c-1)= | | 1000=500(1+i)12 | | G(3b)=4(3b)-6 | | [-(w^2z+4w-5z)-(-6w-7z)]+[-8w^2z-2w]=5w^2z+12z | | 3x^2+18+27=0 | | 100/52 | | .05x=.97 | | 3m+2n-(7-m)=1 | | 3(X-1)+12=2X | | 7/x-6=3x/x-6 | | n/40=5/100 | | -2n+m=4 | | 11=-7x | | 5x+35=-40 | | 2X+14Y=52 | | 6(a+3)=2(a+12) | | x+15=5s | | 3*3.14= | | 2(1000)+9p-93=0 | | 150°*3.14/180 |