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r in (-oo:+oo)
r/(-7.6) = 3.05 // - 3.05
r/(-7.6)-3.05 = 0
-0.13157895*r-3.05 = 0 // + 3.05
-0.13157895*r = 3.05 // : -0.13157895
r = 3.05/(-0.13157895)
r = -23.17999954
r = -23.17999954
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