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x in (-oo:+oo)
y = 40-((5*x)/2) // - 40-((5*x)/2)
(5*x)/2+y-40 = 0
5/2*x+y-40 = 0 // - y-40
5/2*x = -(y-40) // : 5/2
x = (-(y-40))/5/2
x = 2/5*(40-y)
x = 2/5*(40-y)
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