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n in (-oo:+oo)
6/7-((5/6)*n) = 3*n-(125/42) // - 3*n-(125/42)
6/7-((5/6)*n)-(3*n)+125/42 = 0
(-5/6)*n-3*n+6/7+125/42 = 0
23/6-23/6*n = 0 // - 23/6
-23/6*n = -23/6 // : -23/6
n = -23/6/(-23/6)
n = 1
n = 1
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