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r in (-oo:+oo)
-5/2 = r/4 // - r/4
-(r/4)-5/2 = 0
-1/4*r-5/2 = 0 // + 5/2
-1/4*r = 5/2 // : -1/4
r = 5/2/(-1/4)
r = -10
r = -10
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