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r in (-oo:+oo)
-25/36 = (5/6)*r // - (5/6)*r
-((5/6)*r)-25/36 = 0
(-5/6)*r-25/36 = 0
-5/6*r-25/36 = 0 // + 25/36
-5/6*r = 25/36 // : -5/6
r = 25/36/(-5/6)
r = -5/6
r = -5/6
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