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z in (-oo:+oo)
-9 = z/(-3)-3 // - z/(-3)-3
3-(z/(-3))-9 = 0
1/3*z-6 = 0 // + 6
1/3*z = 6 // : 1/3
z = 6/1/3
z = 18
z = 18
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