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Y in (-oo:+oo)
Y/12 = 2/13 // - 2/13
Y/12-(2/13) = 0
Y/12-2/13 = 0
1/12*Y-2/13 = 0 // + 2/13
1/12*Y = 2/13 // : 1/12
Y = 2/13/1/12
Y = 24/13
Y = 24/13
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