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r in (-oo:+oo)
r/4.5 = 6 // - 6
r/4.5-6 = 0
0.22222222*r-6 = 0 // + 6
0.22222222*r = 6 // : 0.22222222
r = 6/0.22222222
r = 27.00000027
r = 27.00000027
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