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r in (-oo:+oo)
r/(-6) = 0.5 // - 0.5
r/(-6)-0.5 = 0
-1/6*r-0.5 = 0 // + 0.5
-1/6*r = 0.5 // : -1/6
r = 0.5/(-1/6)
r = -2.99999994
r = -2.99999994
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