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Y in (-oo:+oo)
5/7 = Y/12 // - Y/12
5/7-(Y/12) = 0
5/7-1/12*Y = 0 // - 5/7
-1/12*Y = -5/7 // : -1/12
Y = -5/7/(-1/12)
Y = 60/7
Y = 60/7
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