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x in (-oo:+oo)
y = 4-((5/8)*x) // - 4-((5/8)*x)
(5/8)*x+y-4 = 0
5/8*x+y-4 = 0 // - y-4
5/8*x = -(y-4) // : 5/8
x = (-(y-4))/5/8
x = 8/5*(4-y)
x = 8/5*(4-y)
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