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r in (-oo:+oo)
-5/7 = r/14 // - r/14
-(r/14)-5/7 = 0
-1/14*r-5/7 = 0 // + 5/7
-1/14*r = 5/7 // : -1/14
r = 5/7/(-1/14)
r = -10
r = -10
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