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r in (-oo:+oo)
(1*r)/(-5)-3 = 14 // - 14
(1*r)/(-5)-14-3 = 0
r/(-5)-14-3 = 0
-1/5*r-17 = 0 // + 17
-1/5*r = 17 // : -1/5
r = 17/(-1/5)
r = -85
r = -85
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