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