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z in (-oo:+oo)
(1/2)*z-5.5 = 4.5 // - 4.5
(1/2)*z-5.5-4.5 = 0
1/2*z-10 = 0 // + 10
1/2*z = 10 // : 1/2
z = 10/1/2
z = 20
z = 20
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