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y in (-oo:+oo)
y = 1-ln(4/9) // - 1-ln(4/9)
y+ln(4/9)-1 = 0
y+ln(4/9)-1 = 0 // - ln(4/9)-1
y = -(ln(4/9)-1)
y = 1-ln(4/9)
y = 1-ln(4/9)
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