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Y in (-oo:+oo)
Y/1.2 = 15 // - 15
Y/1.2-15 = 0
0.83333333*Y-15 = 0 // + 15
0.83333333*Y = 15 // : 0.83333333
Y = 15/0.83333333
Y = 18.00000007
Y = 18.00000007
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