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z in (-oo:+oo)
8-((2/3)*z) = 2 // - 2
8-((2/3)*z)-2 = 0
(-2/3)*z-2+8 = 0
6-2/3*z = 0 // - 6
-2/3*z = -6 // : -2/3
z = -6/(-2/3)
z = 9
z = 9
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