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)
5/7 = 12/x // - 12/x
5/7-(12/x) = 0
5/7-12*x^-1 = 0
-12*x^-1 = -5/7 // : -12
x^-1 = 5/84
-1 < 0
1/(x^1) = 5/84 // * x^1
1 = 5/84*x^1 // : 5/84
84/5 = x^1
x = 84/5
x = 84/5
| 3(d+3)=5(7d-43) | | 18/5=15/x | | 4x+24=72-2x | | g(x)=(x-3)(x+1) | | 20/30=100/x | | 3=6/q | | 5X=6Y+8 | | 4w-3=2w+3 | | 5/4=x/1 | | 93+-5x=105+-8x | | 8/50=x/150 | | x^2-7x=0 | | -2=d-4 | | 9(p-5)=99 | | 4w-3=2+3 | | 673+x=455 | | 5/4=1/x | | -1x+82=-11x+122 | | -4.6-3z-3.4-z=3z+7.9 | | 3=-s+1 | | 1500/5=3000/x | | 9x-3(1/4)=12 | | 7+2x=28+-1x | | 1/2=2/x | | 12=3x-x-4x | | 12/5=36/x | | 20m=-240 | | -4x+56=62-6x | | 2/20 | | 10y+20=50 | | 586+x=1384 | | 9c-81=72+8c |