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z in (-oo:+oo)
z+z-(5/2)+43/9 = -2 // + 2
z+z-(5/2)+43/9+2 = 0
z+z-5/2+43/9+2 = 0
2*z+77/18 = 0 // - 77/18
2*z = -77/18 // : 2
z = -77/18/2
z = -77/36
z = -77/36
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