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z in (-oo:+oo)
16 = (-8/3)*z // - (-8/3)*z
16-((-8/3)*z) = 0
(8/3)*z+16 = 0
8/3*z+16 = 0 // - 16
8/3*z = -16 // : 8/3
z = -16/8/3
z = -6
z = -6
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