If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( r )
10*(r+6) = 0
10*(r+6) = 0
10*(r+6) = 0
r+6 = 0 // - 6
r = -6
r in (-oo:-6) U (-6:+oo)
2 = (3*(r+4))/(10*(r+6)) // - (3*(r+4))/(10*(r+6))
2-((3*(r+4))/(10*(r+6))) = 0
(-3/10)*(r+6)^-1*(r+4)+2 = 0
(-3/10*(r+4))/(r+6)+2 = 0
(-3/10*(r+4))/(r+6)+(2*(r+6))/(r+6) = 0
2*(r+6)-3/10*(r+4) = 0
17/10*r+54/5 = 0
(17/10*r+54/5)/(r+6) = 0
(17/10*r+54/5)/(r+6) = 0 // * r+6
17/10*r+54/5 = 0
17/10*r+54/5 = 0 // - 54/5
17/10*r = -54/5 // : 17/10
r = -54/5/17/10
r = -108/17
r = -108/17
| 5y+8=43 | | 216x^3-125=0 | | 8x+5-3x=6+4x-11+3x | | (3g+14)/6=5(g+2) | | 8p+2p=10 | | (3g+14)/6 | | 10a-7a=15 | | 17n-5n-9n-2n-1=94 | | 5/14=l/7 | | 15c+9c+13c+12c-34c-9=96 | | 9(3x+2)=126 | | 9m-1=0 | | -5x-7=x-103 | | -8(t-8)+2t=-9+t | | (35x^2+30x-11)/5x | | 11(3x+10)=440 | | 16k-14k+27k=87 | | 12(3x+9)=252 | | 8-(w+4)=-3 | | -98h+53h-33h+30h+-61=35 | | -6(x-4)+x=-3(1-x) | | 67h-49h+26h=88 | | -8x=-8x+41 | | -61q-(-19q)+78q-92q+80q=96 | | 20(3x+12)=840 | | 5-6m/m^2-25 | | 1/5y=-7 | | -75d-(-47d)=84 | | x^-2y^6/x^-8y^-1=0 | | -29v+98v+-74=-5 | | 14y-4/5(10y+30) | | -49+z=-49-z |