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z in (-oo:+oo)
z+5/2 = 4-(z/7) // - 4-(z/7)
z+z/7+5/2-4 = 0
8/7*z-3/2 = 0 // + 3/2
8/7*z = 3/2 // : 8/7
z = 3/2/8/7
z = 21/16
z = 21/16
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