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z in (-oo:+oo)
(-1/2)*z = 3/4-(1/4) // - 3/4-(1/4)
(-1/2)*z-(3/4)+1/4 = 0
(-1/2)*z-3/4+1/4 = 0
-1/2*z-1/2 = 0 // + 1/2
-1/2*z = 1/2 // : -1/2
z = 1/2/(-1/2)
z = -1
z = -1
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