If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
2/r = 8/11 // - 8/11
2/r-(8/11) = 0
2/r-8/11 = 0
2*r^-1 = 8/11 // : 2
r^-1 = 4/11
-1 < 0
1/(r^1) = 4/11 // * r^1
1 = 4/11*r^1 // : 4/11
11/4 = r^1
r = 11/4
r = 11/4
| 24z+27=-10 | | 80=8(b+6)-8 | | -5(1+2x)-5=2(1-4x) | | -7(4-7x)+5=173 | | d/1/8=24 | | 2x+26=x-6 | | 24z+27=10 | | x-4/3x*2-75 | | -4(6x+8)=-92 | | y/18=7 | | 9u-17=46 | | 7+N=18 | | 3/4k-3=2 | | c=-x(x+6) | | x-4/3x^2-75 | | s*5+43=103 | | 8-2x+3(4.5x+9)= | | ln3/2=.3x | | -5(b-5)-2(2b+1)=4 | | -(x^2)-6x=0 | | (-5x^2y^2)(-5x^4y)= | | 23-3x=12+8x | | m+35=13 | | 6n+5=5 | | 11t^2/6*9/33t | | 2(3x+6)=4 | | 9h^2=3h | | 19-34= | | 6/n-10=2 | | 1/2x-3/4=5/8 | | (3x^2+10)=(9x+50) | | x+4=20-4*4*4*4 |