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r in (-oo:+oo)
r/27 = 3/9 // - 3/9
r/27-(3/9) = 0
r/27-1/3 = 0
1/27*r-1/3 = 0 // + 1/3
1/27*r = 1/3 // : 1/27
r = 1/3/1/27
r = 9
r = 9
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