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 = 0
y = 0
y in (-oo:0) U (0:+oo)
8 = 16/y // - 16/y
8-(16/y) = 0
8-16*y^-1 = 0
-16*y^-1 = -8 // : -16
y^-1 = 1/2
-1 < 0
1/(y^1) = 1/2 // * y^1
1 = 1/2*y^1 // : 1/2
2 = y^1
y = 2
y = 2
| -15x-18=-153 | | -15x-11=-71 | | 2x-100+x(2x-100)1000+x=5000 | | 7+11-2=15 | | 7/8y | | 0.11y+0.02(y+9000)=960 | | x^2+5*X+10=0 | | x^2+2*x*y+y^2=5 | | (x^2-4)*(x^2-10)=72 | | (6-5i)(-3+2i)=0 | | 5y+10x+15x+4y+80+72=360 | | (y+1)2x=68 | | 2(x-0.5)=7 | | (y+1)2x+3=64 | | (y+1)2+3y=67 | | (y+1)2+3y=65 | | 6y-18x=36 | | (y+1)2+3y=64 | | (x+1)2x+3y=64 | | (y+1)2x+3y=63 | | 5x^2+7y^2+100=0 | | a^2+b^2+c^2+42=2a+8b+10c | | 12(2/3-3x) | | 6/5x(5-4x)=-24 | | 8(2a+3)-12=129-8 | | x-x+15=21 | | 4s+25=-5 | | Y=4/.8 | | -9h-15=36 | | 12h=4(5-2h) | | 21n(2x)=-4 | | 4+5(7-x)=-1 |