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z in (-oo:+oo)
z/4+2 = 6-(z/4) // - 6-(z/4)
z/4+z/4-6+2 = 0
1/2*z-4 = 0 // + 4
1/2*z = 4 // : 1/2
z = 4/1/2
z = 8
z = 8
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