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r in (-oo:+oo)
r/2 = (r+3)/6 // - (r+3)/6
r/2-((r+3)/6) = 0
(-1*(r+3))/6+r/2 = 0
(-1*2*(r+3))/(2*6)+(6*r)/(2*6) = 0
6*r-1*2*(r+3) = 0
4*r-6 = 0
(4*r-6)/(2*6) = 0
(4*r-6)/(2*6) = 0 // * 2*6
4*r-6 = 0
4*r-6 = 0 // + 6
4*r = 6 // : 4
r = 6/4
r = 3/2
r = 3/2
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