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x in (-oo:+oo)
y = (1/2)*x-6 // - (1/2)*x-6
y-((1/2)*x)+6 = 0
(-1/2)*x+y+6 = 0
y-1/2*x+6 = 0 // - y+6
-1/2*x = -(y+6) // : -1/2
x = (-(y+6))/(-1/2)
x = 2*(y+6)
x = 2*(y+6)
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