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z in (-oo:+oo)
z/2+z/3-(z/6) = 8 // - 8
z/2+z/3-(z/6)-8 = 0
2/3*z-8 = 0 // + 8
2/3*z = 8 // : 2/3
z = 8/2/3
z = 12
z = 12
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