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^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
12*x-(1500/(x^2)) = 0
12*x-1500*x^-2 = 0
12*x^1-1500*x^-2 = 0
(12*x^3-1500*x^0)/(x^2) = 0 // * x^4
x^2*(12*x^3-1500*x^0) = 0
x^2
12*x^3-1500 = 0
{ 1, -1, 2, -2, 3, -3, 4, -4, 5, -5, 6, -6, 10, -10, 12, -12, 15, -15, 20, -20, 25, -25, 30, -30, 50, -50, 60, -60, 75, -75, 100, -100, 125, -125, 150, -150, 250, -250, 300, -300, 375, -375, 500, -500, 750, -750, 1500, -1500 }
1
x = 1
12*x^3-1500 = -1488
1
-1
x = -1
12*x^3-1500 = -1512
-1
2
x = 2
12*x^3-1500 = -1404
2
-2
x = -2
12*x^3-1500 = -1596
-2
3
x = 3
12*x^3-1500 = -1176
3
-3
x = -3
12*x^3-1500 = -1824
-3
4
x = 4
12*x^3-1500 = -732
4
-4
x = -4
12*x^3-1500 = -2268
-4
5
x = 5
12*x^3-1500 = 0
5
x-5
12*x^2+60*x+300
12*x^3-1500
x-5
60*x^2-12*x^3
60*x^2-1500
300*x-60*x^2
300*x-1500
1500-300*x
0
12*x^2+60*x+300 = 0
DELTA = 60^2-(4*12*300)
DELTA = -10800
DELTA < 0
x in { 5}
x = 5
| -33y-162y=-12+162-63 | | 12x-123456=54x | | y/4-y/2+1=0 | | (9y+8y-2)-(9y+5y-1)=14 | | 12c=8616 | | 1/2(5x-5)=7 | | 24x^2+x-3= | | 3+4(5x-6)=21 | | 0.9c=1.89 | | -x^4+64x^2=0 | | 2ln(6x)=8 | | -3(x-7)=5(x+6)-10 | | 7x^2-114x-25=0 | | 14y=7 | | -100-54y=-45+150 | | 20.4=12m | | 3x^2-64y+380=0 | | 2xy+x^2+9=0 | | 64=4g | | 12x+5-2x+3=-32 | | p^2-15=2 | | 10b=35 | | 2u^2+22u+60-u^2-12u-35=0 | | -30x-8x=24+24 | | 3s^2-23s-8= | | -14Z+25Z=22-8Z-8Z | | 3(3x+5)=95 | | 25h=450 | | 525+0.21*500= | | 24=(17-x)+14+(x-7) | | 10a^2+39a+14= | | 6c=17.64 |