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x in (-oo:+oo)
y = (-5/8)*x+1 // - (-5/8)*x+1
y-((-5/8)*x)-1 = 0
(5/8)*x+y-1 = 0
5/8*x+y-1 = 0 // - y-1
5/8*x = -(y-1) // : 5/8
x = (-(y-1))/5/8
x = 8/5*(1-y)
x = 8/5*(1-y)
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