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r in (-oo:+oo)
r/6 = 10.5/9 // - 10.5/9
r/6-(10.5/9) = 0
r/6-1.16666667 = 0
1/6*r-1.16666667 = 0 // + 1.16666667
1/6*r = 1.16666667 // : 1/6
r = 1.16666667/1/6
r = 6.99999988
r = 6.99999988
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