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z in (-oo:+oo)
z/0.5 = 8.3 // - 8.3
z/0.5-8.3 = 0
2*z-8.3 = 0 // + 8.3
2*z = 8.3 // : 2
z = 8.3/2
z = 4.15
z = 4.15
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