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