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r in (-oo:+oo)
r/13.5 = 8/6 // - 8/6
r/13.5-(8/6) = 0
r/13.5-4/3 = 0
0.07407407*r-4/3 = 0 // + 4/3
0.07407407*r = 4/3 // : 0.07407407
r = 4/3/0.07407407
r = 18.00000095
r = 18.00000095
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