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