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r in (-oo:+oo)
20 = 40-((2.5*r)/0.5) // - 40-((2.5*r)/0.5)
(2.5*r)/0.5-40+20 = 0
5*r-20 = 0 // + 20
5*r = 20 // : 5
r = 20/5
r = 4
r = 4
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