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z in (-oo:+oo)
3/4-z = 1/12 // - 1/12
3/4-z-(1/12) = 0
3/4-z-1/12 = 0
2/3-z = 0 // - 2/3
-z = -2/3 // * -1
z = 2/3
z = 2/3
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