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z in (-oo:+oo)
z+z-(38/5)-(17/8) = -12 // + 12
z+z-(38/5)-(17/8)+12 = 0
z+z-38/5-17/8+12 = 0
2*z+91/40 = 0 // - 91/40
2*z = -91/40 // : 2
z = -91/40/2
z = -91/80
z = -91/80
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