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