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r in (-oo:+oo)
r/0.2 = 4.8 // - 4.8
r/0.2-4.8 = 0
5*r-4.8 = 0 // + 4.8
5*r = 4.8 // : 5
r = 4.8/5
r = 0.96
r = 0.96
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