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n in (-oo:+oo)
(3/7)*n-(6*n)-8 = -470/49 // + -470/49
(3/7)*n-(6*n)-(-470/49)-8 = 0
(3/7)*n-6*n+470/49-8 = 0
78/49-39/7*n = 0 // - 78/49
-39/7*n = -78/49 // : -39/7
n = -78/49/(-39/7)
n = 2/7
n = 2/7
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