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x in (-oo:+oo)
Y-1 = (5/6)*x // - (5/6)*x
Y-((5/6)*x)-1 = 0
Y+(-5/6)*x-1 = 0
Y-5/6*x-1 = 0 // - Y-1
-5/6*x = -(Y-1) // : -5/6
x = (-(Y-1))/(-5/6)
x = -6/5*(1-Y)
x = -6/5*(1-Y)
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