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