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z in (-oo:+oo)
6*(-1/2)-(3*z) = 9 // - 9
6*(-1/2)-(3*z)-9 = 0
6*(-1/2)-3*z-9 = 0
-3*z-12 = 0 // + 12
-3*z = 12 // : -3
z = 12/(-3)
z = -4
z = -4
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