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x in (-oo:+oo)
y = -x/2-4 // + -x/2-4
y-(-x/2)+4 = 0
(1/2)*x+y+4 = 0
1/2*x+y+4 = 0 // - y+4
1/2*x = -(y+4) // : 1/2
x = (-(y+4))/1/2
x = -2*(y+4)
x = -2*(y+4)
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