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