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r in (-oo:+oo)
4*r = 5/2 // - 5/2
4*r-(5/2) = 0
4*r-5/2 = 0
4*r-5/2 = 0 // + 5/2
4*r = 5/2 // : 4
r = 5/2/4
r = 5/8
r = 5/8
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