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r in (-oo:+oo)
(8-(5*r))/6 = 3 // - 3
(8-(5*r))/6-3 = 0
(8-5*r)/6-3 = 0
(8-5*r)/6+(-3*6)/6 = 0
8-5*r-3*6 = 0
-5*r-10 = 0
(-5*r-10)/6 = 0
(-5*r-10)/6 = 0 // * 6
-5*r-10 = 0
-5*r-10 = 0 // + 10
-5*r = 10 // : -5
r = 10/(-5)
r = -2
r = -2
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