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