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x in (-oo:+oo)
y = (-1/3)*x-8 // - (-1/3)*x-8
y-((-1/3)*x)+8 = 0
(1/3)*x+y+8 = 0
1/3*x+y+8 = 0 // - y+8
1/3*x = -(y+8) // : 1/3
x = (-(y+8))/1/3
x = -3*(y+8)
x = -3*(y+8)
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