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x in (-oo:+oo)
40-y = 250-((2/5)*x) // - 250-((2/5)*x)
(2/5)*x-y-250+40 = 0
2/5*x-y-210 = 0 // + -y-210
2/5*x = -(-y-210) // : 2/5
x = (-(-y-210))/2/5
x = 5/2*(y+210)
x = 5/2*(y+210)
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