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z in (-oo:+oo)
-4 = (-2/3)*z // - (-2/3)*z
-((-2/3)*z)-4 = 0
(2/3)*z-4 = 0
2/3*z-4 = 0 // + 4
2/3*z = 4 // : 2/3
z = 4/2/3
z = 6
z = 6
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