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z in (-oo:+oo)
(2/3)*z = 6*z-128 // - 6*z-128
(2/3)*z-(6*z)+128 = 0
(2/3)*z-6*z+128 = 0
128-16/3*z = 0 // - 128
-16/3*z = -128 // : -16/3
z = -128/(-16/3)
z = 24
z = 24
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