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n in (-oo:+oo)
(6/7)*n = 6/35 // - 6/35
(6/7)*n-(6/35) = 0
(6/7)*n-6/35 = 0
6/7*n-6/35 = 0 // + 6/35
6/7*n = 6/35 // : 6/7
n = 6/35/6/7
n = 1/5
n = 1/5
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