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z in (-oo:+oo)
z/2 = 2/12 // - 2/12
z/2-(2/12) = 0
z/2-1/6 = 0
1/2*z-1/6 = 0 // + 1/6
1/2*z = 1/6 // : 1/2
z = 1/6/1/2
z = 1/3
z = 1/3
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