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r in (-oo:+oo)
r/42 = 28/75 // - 28/75
r/42-(28/75) = 0
r/42-28/75 = 0
1/42*r-28/75 = 0 // + 28/75
1/42*r = 28/75 // : 1/42
r = 28/75/1/42
r = 392/25
r = 392/25
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