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