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