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r in (-oo:+oo)
(3*(2*r-6))/5 = 3*r-(2/6) // - 3*r-(2/6)
(3*(2*r-6))/5-(3*r)+2/6 = 0
(3*(2*r-6))/5-3*r+2/6 = 0
(3*(2*r-6))/5-3*r+1/3 = 0
(3^2*(2*r-6))/(3*5)+(-3*3*5*r)/(3*5)+(1*5)/(3*5) = 0
3^2*(2*r-6)-3*3*5*r+1*5 = 0
5-27*r-54 = 0
-27*r-49 = 0
(-27*r-49)/(3*5) = 0
(-27*r-49)/(3*5) = 0 // * 3*5
-27*r-49 = 0
-27*r-49 = 0 // + 49
-27*r = 49 // : -27
r = 49/(-27)
r = -49/27
r = -49/27
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