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