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