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r in (-oo:+oo)
24 = r/2.5 // - r/2.5
24-(r/2.5) = 0
24-0.4*r = 0
24-0.4*r = 0 // - 24
-0.4*r = -24 // : -0.4
r = -24/(-0.4)
r = 60
r = 60
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