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r in (-oo:+oo)
r/6 = 3/7 // - 3/7
r/6-(3/7) = 0
r/6-3/7 = 0
1/6*r-3/7 = 0 // + 3/7
1/6*r = 3/7 // : 1/6
r = 3/7/1/6
r = 18/7
r = 18/7
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