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r in (-oo:+oo)
4/9 = (r-3)/6 // - (r-3)/6
4/9-((r-3)/6) = 0
(-1*(r-3))/6+4/9 = 0
(-1*9*(r-3))/(6*9)+(4*6)/(6*9) = 0
4*6-1*9*(r-3) = 0
51-9*r = 0
(51-9*r)/(6*9) = 0
(51-9*r)/(6*9) = 0 // * 6*9
51-9*r = 0
51-9*r = 0 // - 51
-9*r = -51 // : -9
r = -51/(-9)
r = 17/3
r = 17/3
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