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z in (-oo:+oo)
z+z-(3/6)+12/9 = 0
z+z-1/2+12/9 = 0
2*z+5/6 = 0 // - 5/6
2*z = -5/6 // : 2
z = -5/6/2
z = -5/12
z = -5/12
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