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z in (-oo:+oo)
z/26 = 3/13 // - 3/13
z/26-(3/13) = 0
z/26-3/13 = 0
1/26*z-3/13 = 0 // + 3/13
1/26*z = 3/13 // : 1/26
z = 3/13/1/26
z = 6
z = 6
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