A carpenter has a wood (15x+16) feet long. Represent the length of the wood after (5x-9) feet have been cut off.
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15 x + 16 - ( 5 x - 9 ) =
15 x + 16 - 5 x - ( - 9 ) =
15 x - 5 x + 16 + 9 =
10 x + 25 =
5 ∙ 2 x + 5 ∙ 5 =
5 ( 2 x + 5 )