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Y in (-oo:+oo)
Y/1.2 = 4 // - 4
Y/1.2-4 = 0
0.83333333*Y-4 = 0 // + 4
0.83333333*Y = 4 // : 0.83333333
Y = 4/0.83333333
Y = 4.80000002
Y = 4.80000002
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