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n in (-oo:+oo)
(2/5)*n+9/10 = (-1/5)*n-(23/10) // - (-1/5)*n-(23/10)
(2/5)*n-((-1/5)*n)+9/10+23/10 = 0
(2/5)*n+(1/5)*n+9/10+23/10 = 0
3/5*n+16/5 = 0 // - 16/5
3/5*n = -16/5 // : 3/5
n = -16/5/3/5
n = -16/3
n = -16/3
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