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x in (-oo:+oo)
Y = (1/2)*x-8 // - (1/2)*x-8
Y-((1/2)*x)+8 = 0
Y+(-1/2)*x+8 = 0
Y-1/2*x+8 = 0 // - Y+8
-1/2*x = -(Y+8) // : -1/2
x = (-(Y+8))/(-1/2)
x = 2*(Y+8)
x = 2*(Y+8)
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