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z in (-oo:+oo)
6 = z/3+2+9 // - z/3+2+9
6-(z/3)-9-2 = 0
-1/3*z-5 = 0 // + 5
-1/3*z = 5 // : -1/3
z = 5/(-1/3)
z = -15
z = -15
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