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n in (-oo:+oo)
(7*n-1)/4 = 5 // - 5
(7*n-1)/4-5 = 0
(7*n-1)/4+(-5*4)/4 = 0
7*n-5*4-1 = 0
7*n-21 = 0
(7*n-21)/4 = 0
(7*n-21)/4 = 0 // * 4
7*n-21 = 0
7*n-21 = 0 // + 21
7*n = 21 // : 7
n = 21/7
n = 3
n = 3
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