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z in (-oo:+oo)
(z-3)/2 = 7 // - 7
(z-3)/2-7 = 0
(z-3)/2+(-7*2)/2 = 0
z-7*2-3 = 0
z-17 = 0
(z-17)/2 = 0
(z-17)/2 = 0 // * 2
z-17 = 0
z-17 = 0 // + 17
z = 17
z = 17
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