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x in (-oo:+oo)
y = 40/8-((4*x)/8) // - 40/8-((4*x)/8)
(4*x)/8+y-(40/8) = 0
(4*x)/8+y-5 = 0
1/2*x+y-5 = 0 // - y-5
1/2*x = -(y-5) // : 1/2
x = (-(y-5))/1/2
x = 2*(5-y)
x = 2*(5-y)
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