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