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n in (-oo:+oo)
((3*n)/5)*n+n/5+9/10 = -23/10 // + -23/10
((3*n)/5)*n+n/5+9/10-(-23/10) = 0
((3*n)/5)*n+n/5+9/10+23/10 = 0
3/5*n^2+1/5*n+16/5 = 0
DELTA = (1/5)^2-(3/5*16/5*4)
DELTA = -191/25
DELTA < 0
n belongs to the empty set
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