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Y in (-oo:+oo)
3.4 = Y/1.2+5.6 // - Y/1.2+5.6
3.4-(Y/1.2)-5.6 = 0
3.4-0.83333333*Y-5.6 = 0
-0.83333333*Y-2.2 = 0 // + 2.2
-0.83333333*Y = 2.2 // : -0.83333333
Y = 2.2/(-0.83333333)
Y = -2.64000001
Y = -2.64000001
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