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z in (-oo:+oo)
z/6+3 = 8-(z/6) // - 8-(z/6)
z/6+z/6-8+3 = 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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