If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( y )
y = 0
y^2 = 0
y = 0
y = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
27-(12*y)-40/(y^2) = (2*y)/y-3 // - (2*y)/y-3
3-(12*y)-40/(y^2)-((2*y)/y)+27 = 0
3-12*y-40/(y^2)-2+27 = 0
28*y^0-12*y^1-40*y^-2 = 0
(28*y^2-12*y^3-40*y^0)/(y^2) = 0 // * y^4
y^2*(28*y^2-12*y^3-40*y^0) = 0
y^2
28*y^2-12*y^3-40 = 0
{ 1, -1, 2, -2, 4, -4, 5, -5, 8, -8, 10, -10, 20, -20, 40, -40 }
1
y = 1
28*y^2-12*y^3-40 = -24
1
-1
y = -1
28*y^2-12*y^3-40 = 0
-1
y+1
40*y-12*y^2-40
28*y^2-12*y^3-40
y+1
12*y^3+12*y^2
40*y^2-40
-40*y^2-40*y
-40*y-40
40*y+40
0
40*y-12*y^2-40 = 0
DELTA = 40^2-(-40*(-12)*4)
DELTA = -320
DELTA < 0
y in { -1}
y = -1
| 8x+x^2=48 | | 0=4x^2+x-5 | | 7x+258=2x+66 | | 7y-7x=1 | | 33-(-15)+(-8)-2= | | 5x+12=40 | | 9*2/3 | | f(x)=4x^3-18x^2+24x-8 | | 8+3-4= | | 10(2x-5)=30 | | .8k=-12 | | f(x)=x^3-x^2-2x+3 | | 6t-5=4t-1 | | 0=30-34x+3x^2 | | 12x-3x+2x=7766 | | Y=6x^2+11x+3 | | 2.50x+3.50(8-x)=23.00 | | 5x+12=50 | | 0=30-3x+3x^2 | | 8(x-6)=24 | | 4x+8x+4.345= | | f(x)=x^3+2x^2+5 | | 9x-3=2x+53 | | 2xn+12=52 | | 9x-3=2x | | 2x^3-3x^2-20=0 | | 3+5z-7+2yz-8z= | | -4x-15=37 | | 53x-1=125 | | y-9=(6/5)(x+6) | | 9x-x-x+x=648 | | 24x^2+x+3=0 |