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