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z in (-oo:+oo)
z/4+3 = 9-(z/4) // - 9-(z/4)
z/4+z/4-9+3 = 0
1/2*z-6 = 0 // + 6
1/2*z = 6 // : 1/2
z = 6/1/2
z = 12
z = 12
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