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