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