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 = 1000*(15000/x) // - 1000*(15000/x)
5-(1000*(15000/x)) = 0
5-15000000*x^-1 = 0
-15000000*x^-1 = -5 // : -15000000
x^-1 = 1/3000000
-1 < 0
1/(x^1) = 1/3000000 // * x^1
1 = 1/3000000*x^1 // : 1/3000000
3000000 = x^1
x = 3000000
x = 3000000
| y=3x^4-11x^2+10 | | 2x-27=18-3x | | y=3x^4-11x+10 | | (3y-5)(4y-7)= | | x*7-32=115 | | X/2=3/7 | | 18=w-4w | | 0.9=22500/x | | 5=15000/x)*1000 | | 3.50=(13500/x)*1000 | | 0=-4t^2+14t+1 | | 0.30=9000/x | | 0.75=13500/x | | 1.05=9000/x | | 0.90=22500/x | | 0.20=15500/x | | 0.60=22500/x | | 0.85=15000/x | | 12x-7=3x+11 | | 10w-17=83 | | 340/6 | | 40x+16x^2=555 | | (2f-7)/3=6 | | (a-2)/4=3 | | 2=-x-7 | | -2/7x=3/4 | | 29x-7y=5 | | x-.045x-.2y=100 | | x+0.17x=7000000 | | x-4.5x-20y=100 | | K^2-7K-10=0 | | 1-b=2+3b-3-4b |