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n in (-oo:+oo)
n+9 = 127/15-((3/5)*n) // - 127/15-((3/5)*n)
n+(3/5)*n-(127/15)+9 = 0
n+(3/5)*n-127/15+9 = 0
8/5*n+8/15 = 0 // - 8/15
8/5*n = -8/15 // : 8/5
n = -8/15/8/5
n = -1/3
n = -1/3
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