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z in (-oo:+oo)
(-4/5)*z = 16/25 // - 16/25
(-4/5)*z-(16/25) = 0
(-4/5)*z-16/25 = 0
-4/5*z-16/25 = 0 // + 16/25
-4/5*z = 16/25 // : -4/5
z = 16/25/(-4/5)
z = -4/5
z = -4/5
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