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r in (-oo:+oo)
(1*r)/6 = (1*r)/3-3 // - (1*r)/3-3
(1*r)/6-((1*r)/3)+3 = 0
r/6-(r/3)+3 = 0
3-1/6*r = 0 // - 3
-1/6*r = -3 // : -1/6
r = -3/(-1/6)
r = 18
r = 18
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