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n in (-oo:+oo)
(3/5)*n+9/10 = (-1/5)*n-(23/10) // - (-1/5)*n-(23/10)
(3/5)*n-((-1/5)*n)+9/10+23/10 = 0
(3/5)*n+(1/5)*n+9/10+23/10 = 0
4/5*n+16/5 = 0 // - 16/5
4/5*n = -16/5 // : 4/5
n = -16/5/4/5
n = -4
n = -4
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