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