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r in (-oo:+oo)
2.4 = r/4.5 // - r/4.5
2.4-(r/4.5) = 0
2.4-0.22222222*r = 0
2.4-0.22222222*r = 0 // - 2.4
-0.22222222*r = -2.4 // : -0.22222222
r = -2.4/(-0.22222222)
r = 10.80000011
r = 10.80000011
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