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z in (-oo:+oo)
-5/7 = (-5/6)*z-(2/3) // - (-5/6)*z-(2/3)
2/3-((-5/6)*z)-5/7 = 0
(5/6)*z-5/7+2/3 = 0
5/6*z-1/21 = 0 // + 1/21
5/6*z = 1/21 // : 5/6
z = 1/21/5/6
z = 2/35
z = 2/35
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