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Y in (-oo:+oo)
Y/12 = 17/13 // - 17/13
Y/12-(17/13) = 0
Y/12-17/13 = 0
1/12*Y-17/13 = 0 // + 17/13
1/12*Y = 17/13 // : 1/12
Y = 17/13/1/12
Y = 204/13
Y = 204/13
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