Answer
$-13x+6y$
Work Step by Step
We start with the given expression: $-7x+9y+(-y)+x+(-2y)+(-7x)$
We use the commutative property to group like terms: $-7x+x-7x+9y-y-2y$
We use a form of the distributive property to combine like terms: $(-7+1-7)x+(9-1-2)y$
We add and subtract inside the sets of parentheses: $-13x+6y$
