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x in (-oo:+oo)
y = ((3-x)^1)/2 // - ((3-x)^1)/2
y-(((3-x)^1)/2) = 0
y-((3-x)/2) = 0
(-1*(3-x))/2+y = 0
(-1*(3-x))/2+(2*y)/2 = 0
2*y-1*(3-x) = 0
x+2*y-3 = 0
(x+2*y-3)/2 = 0
(x+2*y-3)/2 = 0 // * 2
x+2*y-3 = 0
x+2*y-3 = 0 // - 2*y-3
x = -(2*y-3)
x = 3-(2*y)
x = 3-(2*y)
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