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z in (-oo:+oo)
z/4+3 = 5-(z/4) // - 5-(z/4)
z/4+z/4-5+3 = 0
1/2*z-2 = 0 // + 2
1/2*z = 2 // : 1/2
z = 2/1/2
z = 4
z = 4
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