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z in (-oo:+oo)
z/6+2 = 9-(z/6) // - 9-(z/6)
z/6+z/6-9+2 = 0
1/3*z-7 = 0 // + 7
1/3*z = 7 // : 1/3
z = 7/1/3
z = 21
z = 21
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