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