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r in (-oo:+oo)
6.25 = r/5 // - r/5
6.25-(r/5) = 0
6.25-1/5*r = 0 // - 6.25
-1/5*r = -6.25 // : -1/5
r = -6.25/(-1/5)
r = 31.25
r = 31.25
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