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n in (-oo:+oo)
5*(n+2)+(n/5)*(10*n+5) = 0
5*(n+2)+1/5*n*(10*n+5) = 0
5*(n+2)+1/5*n*(10*n+5) = 0
2*n^2+6*n+10 = 0
2*n^2+6*n+10 = 0
2*(n^2+3*n+5) = 0
n^2+3*n+5 = 0
DELTA = 3^2-(1*4*5)
DELTA = -11
DELTA < 0
2 = 0
2 = 0
n belongs to the empty set
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