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x in (-oo:+oo)
y = 10-((5/2)*x) // - 10-((5/2)*x)
(5/2)*x+y-10 = 0
5/2*x+y-10 = 0 // - y-10
5/2*x = -(y-10) // : 5/2
x = (-(y-10))/5/2
x = 2/5*(10-y)
x = 2/5*(10-y)
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