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z in (-oo:+oo)
(-4/7)*z = 16/35 // - 16/35
(-4/7)*z-(16/35) = 0
(-4/7)*z-16/35 = 0
-4/7*z-16/35 = 0 // + 16/35
-4/7*z = 16/35 // : -4/7
z = 16/35/(-4/7)
z = -4/5
z = -4/5
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