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