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x in (-oo:+oo)
y = (-1/8)*x-9 // - (-1/8)*x-9
y-((-1/8)*x)+9 = 0
(1/8)*x+y+9 = 0
1/8*x+y+9 = 0 // - y+9
1/8*x = -(y+9) // : 1/8
x = (-(y+9))/1/8
x = -8*(y+9)
x = -8*(y+9)
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