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z in (-oo:+oo)
5*z = 7*z-(8/5) // - 7*z-(8/5)
5*z-(7*z)+8/5 = 0
5*z-7*z+8/5 = 0
8/5-2*z = 0 // - 8/5
-2*z = -8/5 // : -2
z = -8/5/(-2)
z = 4/5
z = 4/5
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