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(n+9)²+(n+11) N+11=0 N==-11 (n+10)²-(n+8) N+8=0 N==-8 -8-11=- | Algebra Quint

(n+9)²+(n+11)
N+11=0
N==-11

(n+10)²-(n+8)
N+8=0
N==-8
-8-11=-19