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n in (-oo:+oo)
n-((2/5)*n)+9 = 177/20 // - 177/20
n-((2/5)*n)-(177/20)+9 = 0
n+(-2/5)*n-177/20+9 = 0
3/5*n+3/20 = 0 // - 3/20
3/5*n = -3/20 // : 3/5
n = -3/20/3/5
n = -1/4
n = -1/4
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