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n in (-oo:+oo)
9-((6/7)*n) = 523/42-5*n // - 523/42-5*n
9-((6/7)*n)-(-5*n)-(523/42) = 0
(-6/7)*n+5*n-523/42+9 = 0
29/7*n-145/42 = 0 // + 145/42
29/7*n = 145/42 // : 29/7
n = 145/42/29/7
n = 5/6
n = 5/6
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