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n in (-oo:+oo)
(1/5)*n-(1/7) = 6/7 // - 6/7
(1/5)*n-(1/7)-(6/7) = 0
(1/5)*n-1/7-6/7 = 0
1/5*n-1 = 0 // + 1
1/5*n = 1 // : 1/5
n = 1/1/5
n = 5
n = 5
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