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)
5/9 = 30/x // - 30/x
5/9-(30/x) = 0
5/9-30*x^-1 = 0
-30*x^-1 = -5/9 // : -30
x^-1 = 1/54
-1 < 0
1/(x^1) = 1/54 // * x^1
1 = 1/54*x^1 // : 1/54
54 = x^1
x = 54
x = 54
| 1-m=-5m+9 | | x^2-2y^2-y=3y+2 | | -2*x+y^2=-2 | | -10-b=10+9b | | -6k-10=-2k+8+10 | | 6p-q=15 | | 2x^2+x-0.8=0 | | 4h=-8+3h | | y=1.4+800 | | 3(19+x)=3 | | -3p-9=-3-2p | | 0.7x+9=2x-14 | | 8t+7=9t | | f(x)=6x^2-4x+21 | | f(f-3)=f+10 | | 120=.90x | | 4xwhat=40 | | 6j+6=5j | | (X-12)/x=.1401 | | (9+8i)(-9+i)= | | 10+3u=10+9u | | 4x^2+9=x^2-16 | | -8/-2= | | 10x-15y=180 | | 9d-9=10d | | -3x+9y=-9 | | 4x-67=-9x+89 | | -2s=-s-8 | | X^2+4x+9=-16.5 | | X=6x^2-15 | | 5g=6g+5 | | -12=r+8 |