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