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z in (-oo:+oo)
(-4/5)*z = 8/15 // - 8/15
(-4/5)*z-(8/15) = 0
(-4/5)*z-8/15 = 0
-4/5*z-8/15 = 0 // + 8/15
-4/5*z = 8/15 // : -4/5
z = 8/15/(-4/5)
z = -2/3
z = -2/3
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