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n in (-oo:+oo)
(-4/7)*n+n+9 = 123/14 // - 123/14
(-4/7)*n+n-(123/14)+9 = 0
(-4/7)*n+n-123/14+9 = 0
3/7*n+3/14 = 0 // - 3/14
3/7*n = -3/14 // : 3/7
n = -3/14/3/7
n = -1/2
n = -1/2
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