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z in (-oo:+oo)
1/2 = z/100 // - z/100
1/2-(z/100) = 0
1/2-1/100*z = 0 // - 1/2
-1/100*z = -1/2 // : -1/100
z = -1/2/(-1/100)
z = 50
z = 50
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