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r in (-oo:+oo)
8*r = 1/9 // - 1/9
8*r-(1/9) = 0
8*r-1/9 = 0
8*r-1/9 = 0 // + 1/9
8*r = 1/9 // : 8
r = 1/9/8
r = 1/72
r = 1/72
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