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x in (-oo:+oo)
y = x/8-(3*x) // - x/8-(3*x)
3*x-(x/8)+y = 0
23/8*x+y = 0 // - y
23/8*x = -y // : 23/8
x = -y/23/8
x = -8/23*y
x = -8/23*y
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