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z in (-oo:+oo)
(-7/9)*z = 3/5 // - 3/5
(-7/9)*z-(3/5) = 0
(-7/9)*z-3/5 = 0
-7/9*z-3/5 = 0 // + 3/5
-7/9*z = 3/5 // : -7/9
z = 3/5/(-7/9)
z = -27/35
z = -27/35
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