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z in (-oo:+oo)
-27 = (3/2)*z // - (3/2)*z
-((3/2)*z)-27 = 0
(-3/2)*z-27 = 0
-3/2*z-27 = 0 // + 27
-3/2*z = 27 // : -3/2
z = 27/(-3/2)
z = -18
z = -18
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