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r in (-oo:+oo)
-36 = (1*r)/5.5 // - (1*r)/5.5
-((1*r)/5.5)-36 = 0
-0.18181818*r-36 = 0
-0.18181818*r-36 = 0 // + 36
-0.18181818*r = 36 // : -0.18181818
r = 36/(-0.18181818)
r = -198.00000198
r = -198.00000198
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