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Y in (-oo:+oo)
3/4 = Y/7 // - Y/7
3/4-(Y/7) = 0
3/4-1/7*Y = 0 // - 3/4
-1/7*Y = -3/4 // : -1/7
Y = -3/4/(-1/7)
Y = 21/4
Y = 21/4
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