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