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x in (-oo:+oo)
y = (-2/3)*x-(1/6) // - (-2/3)*x-(1/6)
y-((-2/3)*x)+1/6 = 0
(2/3)*x+y+1/6 = 0
2/3*x+y+1/6 = 0 // - y+1/6
2/3*x = -(y+1/6) // : 2/3
x = (-(y+1/6))/2/3
x = -3/2*(y+1/6)
x = -3/2*(y+1/6)
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