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z in (-oo:+oo)
z/6+4 = 5-(z/6) // - 5-(z/6)
z/6+z/6-5+4 = 0
1/3*z-1 = 0 // + 1
1/3*z = 1 // : 1/3
z = 1/1/3
z = 3
z = 3
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