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z in (-oo:+oo)
(-7/9)*z = 14/45 // - 14/45
(-7/9)*z-(14/45) = 0
(-7/9)*z-14/45 = 0
-7/9*z-14/45 = 0 // + 14/45
-7/9*z = 14/45 // : -7/9
z = 14/45/(-7/9)
z = -2/5
z = -2/5
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