Answer
$-2n+6$
Work Step by Step
After using the distributive property, we first group like terms to ease simplification. We will then combine like terms to simplify the expression:
$-(n-1)+2(n-2)-3(n-3)$
=$-n+1+2n-4-3n+9$
=$-n+2n-3n+1-4+9$
=$(-n+2n-3n)+(1-4+9)$
=$(-2n)+(6)$
=$-2n+6$
