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)
3/r = 5/1 // - 5/1
3/r-(5/1) = 0
3/r-5 = 0
3*r^-1 = 5 // : 3
r^-1 = 5/3
-1 < 0
1/(r^1) = 5/3 // * r^1
1 = 5/3*r^1 // : 5/3
3/5 = r^1
r = 3/5
r = 3/5
| 8x-2y+16=0 | | 9k=180 | | 27=2v-13 | | -5x=25y-50 | | 10x(2x-4)+5=2x-8 | | -3(10x-3)+10x(3x-3)=X-7 | | 0=x^4-18x^2+6 | | 5/3x(-6/7) | | 2(7k+4)=78 | | 48=4w-16 | | 32/4_2/3=21/2 | | (64-4d^2)*(64-d^2)=1540 | | 111=5x+16 | | 3u+6=3 | | 24x^2+24x+6= | | 4y=12x+48 | | 4/-6=4 | | 5b^3-20b^2-105b= | | x^2=999999999999999999999 | | -4y-45=-7(y+6) | | -5(-7+5n)=-140 | | 7x-14=2x+0.8 | | 6(x+4)=9x-3 | | -4(n+6)=-8 | | -8x+6y=48 | | v-9/5=7 | | 6w+32=8(w+6) | | 3a=a-8 | | 7e+83= | | 2x+3+2x=-9 | | x^2+(p+i)x+(q-5i)=0 | | 7t+10=12t |