11n-(7n-1)-6n+8=11n-7n+1-6n+8=-2n+9=-2*(-6)+9*(-6)=12+(-35)=-23
Вроде так
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11n-(7n-1)-6n+8=11n-7n+1-6n+8=-2n+9=-2*(-6)+9*(-6)=12+(-35)=-23
Вроде так