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r in (-oo:+oo)
r/72 = 103/25 // - 103/25
r/72-(103/25) = 0
r/72-103/25 = 0
1/72*r-103/25 = 0 // + 103/25
1/72*r = 103/25 // : 1/72
r = 103/25/1/72
r = 7416/25
r = 7416/25
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