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r in (-oo:+oo)
1.9 = r/0.3 // - r/0.3
1.9-(r/0.3) = 0
1.9-3.33333333*r = 0
1.9-3.33333333*r = 0 // - 1.9
-3.33333333*r = -1.9 // : -3.33333333
r = -1.9/(-3.33333333)
r = 0.57
r = 0.57
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