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z in (-oo:+oo)
z/4+7 = 8-(z/4) // - 8-(z/4)
z/4+z/4-8+7 = 0
1/2*z-1 = 0 // + 1
1/2*z = 1 // : 1/2
z = 1/1/2
z = 2
z = 2
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