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x in (-oo:+oo)
Y = (1/2)*x+4 // - (1/2)*x+4
Y-((1/2)*x)-4 = 0
Y+(-1/2)*x-4 = 0
Y-1/2*x-4 = 0 // - Y-4
-1/2*x = -(Y-4) // : -1/2
x = (-(Y-4))/(-1/2)
x = -2*(4-Y)
x = -2*(4-Y)
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