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n in (-oo:+oo)
(3*n)/5+n/5+9+10 = -23/10 // + -23/10
(3*n)/5+n/5-(-23/10)+9+10 = 0
(3*n)/5+n/5+23/10+9+10 = 0
4/5*n+213/10 = 0 // - 213/10
4/5*n = -213/10 // : 4/5
n = -213/10/4/5
n = -213/8
n = -213/8
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