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x in (-oo:+oo)
Y = (5/4)*x-(2/1) // - (5/4)*x-(2/1)
Y-((5/4)*x)+2/1 = 0
Y+(-5/4)*x+2 = 0
Y-5/4*x+2 = 0 // - Y+2
-5/4*x = -(Y+2) // : -5/4
x = (-(Y+2))/(-5/4)
x = 4/5*(Y+2)
x = 4/5*(Y+2)
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