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r in (-oo:+oo)
r/(-16.5) = 50 // - 50
r/(-16.5)-50 = 0
-0.06060606*r-50 = 0 // + 50
-0.06060606*r = 50 // : -0.06060606
r = 50/(-0.06060606)
r = -825.00000825
r = -825.00000825
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