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x in (-oo:+oo)
y = (-28/8)*x-((2/8)*x) // - (-28/8)*x-((2/8)*x)
(2/8)*x-((-28/8)*x)+y = 0
(7/2)*x+(2/8)*x+y = 0
15/4*x+y = 0 // - y
15/4*x = -y // : 15/4
x = -y/15/4
x = -4/15*y
x = -4/15*y
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