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