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x in (-oo:+oo)
y = (4-x)/0.5 // - (4-x)/0.5
y-((4-x)/0.5) = 0
y-2*(4-x) = 0
y-2*(4-x) = 0
2*x+y-8 = 0
2*x+y-8 = 0
2*x+y-8 = 0 // - y-8
2*x = -(y-8) // : 2
x = (-(y-8))/2
x = (8-y)/2
x = (8-y)/2
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