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r in (-oo:+oo)
4.7 = r/5 // - r/5
4.7-(r/5) = 0
4.7-1/5*r = 0 // - 4.7
-1/5*r = -4.7 // : -1/5
r = -4.7/(-1/5)
r = 23.5
r = 23.5
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