+9466 -9a - 7x - 9c - 9b - 7y
Numbers can be added in any order, so we can rearrange the expression.
= -9a - 9b - 9c - 7x - 7y
Factor -9 out of the first three terms and -7 out of the last two terms.
= -9(a + b + c) - 7(x + y)
Substitute -1 in for a + b + c and substitute 7 in for x + y .
= -9( -1 ) - 7( 7 )
= 9 - 49
= -40
