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z in (-oo:+oo)
4-((2/3)*z) = 1/2 // - 1/2
4-((2/3)*z)-(1/2) = 0
(-2/3)*z-1/2+4 = 0
7/2-2/3*z = 0 // - 7/2
-2/3*z = -7/2 // : -2/3
z = -7/2/(-2/3)
z = 21/4
z = 21/4
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