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x in (-oo:+oo)
Y = (5/6)*x-4 // - (5/6)*x-4
Y-((5/6)*x)+4 = 0
Y+(-5/6)*x+4 = 0
Y-5/6*x+4 = 0 // - Y+4
-5/6*x = -(Y+4) // : -5/6
x = (-(Y+4))/(-5/6)
x = 6/5*(Y+4)
x = 6/5*(Y+4)
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