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