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z in (-oo:+oo)
z/0.5+5 = 11.5 // - 11.5
z/0.5-11.5+5 = 0
2*z-6.5 = 0 // + 6.5
2*z = 6.5 // : 2
z = 6.5/2
z = 3.25
z = 3.25
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