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z in (-oo:+oo)
-3/4 = (2/3)*z // - (2/3)*z
-((2/3)*z)-3/4 = 0
(-2/3)*z-3/4 = 0
-2/3*z-3/4 = 0 // + 3/4
-2/3*z = 3/4 // : -2/3
z = 3/4/(-2/3)
z = -9/8
z = -9/8
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