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r in (-oo:+oo)
54 = (16625/18)*r // - (16625/18)*r
54-((16625/18)*r) = 0
(-16625/18)*r+54 = 0
54-16625/18*r = 0 // - 54
-16625/18*r = -54 // : -16625/18
r = -54/(-16625/18)
r = 972/16625
r = 972/16625
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