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r in (-oo:+oo)
(r-3)/2 = 6 // - 6
(r-3)/2-6 = 0
(r-3)/2+(-6*2)/2 = 0
r-6*2-3 = 0
r-15 = 0
(r-15)/2 = 0
(r-15)/2 = 0 // * 2
r-15 = 0
r-15 = 0 // + 15
r = 15
r = 15
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