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