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r in (-oo:+oo)
r/6 = 4/9 // - 4/9
r/6-(4/9) = 0
r/6-4/9 = 0
1/6*r-4/9 = 0 // + 4/9
1/6*r = 4/9 // : 1/6
r = 4/9/1/6
r = 8/3
r = 8/3
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