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