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