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