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n in (-oo:+oo)
(3/7)*n-1 = -38/35 // + -38/35
(3/7)*n-(-38/35)-1 = 0
(3/7)*n+38/35-1 = 0
3/7*n+3/35 = 0 // - 3/35
3/7*n = -3/35 // : 3/7
n = -3/35/3/7
n = -1/5
n = -1/5
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