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Y in (-oo:+oo)
(Y-6)/5 = 13 // - 13
(Y-6)/5-13 = 0
(Y-6)/5+(-13*5)/5 = 0
Y-13*5-6 = 0
Y-71 = 0
(Y-71)/5 = 0
(Y-71)/5 = 0 // * 5
Y-71 = 0
Y-71 = 0 // + 71
Y = 71
Y = 71
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