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^2-1 = 0
1/(r-3) = 0
r-3 = 0
r^2-1 = 0
r^2-1 = 0
1*r^2 = 1 // : 1
r^2 = 1
r^2 = 1 // ^ 1/2
abs(r) = 1
r = 1 or r = -1
1/(r-3) = 0
1/(r-3) = 0
1 = 0
r belongs to the empty set
r-3 = 0
r-3 = 0
r-3 = 0 // + 3
r = 3
r in (-oo:-1) U (-1:1) U (1:3) U (3:+oo)
(r-(6/(r^2-1)))/(1/(r-3)) = 0
(r-6*(r^2-1)^-1)/(1/(r-3)) = 0
((r-3)*(r-6/(r^2-1)))/1 = 0
r-6/(r^2-1) = 0
(r*(r^2-1))/(r^2-1)-6/(r^2-1) = 0
r*(r^2-1)-6 = 0
r^3-r-6 = 0
r^3-r-6 = 0
r^3-r-6 = 0
{ 1, -1, 2, -2, 3, -3, 6, -6 }
1
r = 1
r^3-r-6 = -6
1
-1
r = -1
r^3-r-6 = -6
-1
2
r = 2
r^3-r-6 = 0
2
r-2
r^2+2*r+3
r^3-r-6
r-2
2*r^2-r^3
2*r^2-r-6
4*r-2*r^2
3*r-6
6-3*r
0
r^2+2*r+3 = 0
DELTA = 2^2-(1*3*4)
DELTA = -8
DELTA < 0
r in { 2}
r-2 = 0
(r-2)/(r^2-1) = 0
(r-2)/(r^2-1) = 0 // * r^2-1
r-2 = 0
((r-3)*(r-2))/1 = 0
( r-2 )
r-2 = 0 // + 2
r = 2
( r-3 )
r-3 = 0 // + 3
r = 3
r in { 3}
r = 2
| 9(4b-8)-7(8+6b)=-92 | | 4374837094664894578468906432043269436344034630643894368840684683406934890436846895468439648648668436043643645858604646486430468458946904645896568344864508436436045+8460846654689876544785478468464786874674673486473864396474364374674646437647456784643785548 | | 5x+10=7x+28 | | 6(1+3y)=-18-6y | | (4x+1)+(x^2-5)(x)= | | 3(2c+7)=15 | | 18x-16=-12x-4 | | 7k+8+5=-8 | | 1/5(24-8a)=4-a | | 8=5/9x | | 2.8=7(c-.75) | | -4(6x-3)=-12 | | 69785786963760570658965856063429431346464564545+483938620645645684964380468943268436043604= | | 3(6x+7)=10x+45 | | -3+k+3=2 | | c(3)=(x-5)3 | | 8h=4h-4 | | 100x-10x=15 | | D=7/6(m-41) | | 23x-3+2x=12(14x-6) | | 1/3(15-6x)=4-x | | 3+q=3 | | -4x-10=50 | | 6.73+g-8.46=10.22 | | 9(x+2)+3(x+2)=7x-7 | | 8x*2x+1= | | -4(2p+16)=-2p+14 | | 2x-45y=3 | | 5cos^2x-3cosx+2=0 | | 100x-10x=12 | | 6n-6=2n-2 | | -7(x+2)=-5(x-2) |