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z in (-oo:+oo)
1.3 = z/2 // - z/2
1.3-(z/2) = 0
1.3-1/2*z = 0 // - 1.3
-1/2*z = -1.3 // : -1/2
z = -1.3/(-1/2)
z = 2.6
z = 2.6
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