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Y in (-oo:+oo)
1/14 = Y/12 // - Y/12
1/14-(Y/12) = 0
1/14-1/12*Y = 0 // - 1/14
-1/12*Y = -1/14 // : -1/12
Y = -1/14/(-1/12)
Y = 6/7
Y = 6/7
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