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