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Y in (-oo:+oo)
Y/(-1.4) = -15 // + 15
Y/(-1.4)+15 = 0
15-0.71428571*Y = 0 // - 15
-0.71428571*Y = -15 // : -0.71428571
Y = -15/(-0.71428571)
Y = 21.00000013
Y = 21.00000013
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