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z in (-oo:+oo)
-4/3 = (2/3)*z // - (2/3)*z
-((2/3)*z)-4/3 = 0
(-2/3)*z-4/3 = 0
-2/3*z-4/3 = 0 // + 4/3
-2/3*z = 4/3 // : -2/3
z = 4/3/(-2/3)
z = -2
z = -2
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