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y cut a piece of wood into 3 pieces of the same length. after he cuts off 2 feet from one of the pieces, he is left with piece that is 5 feet long. what is the length of the piece of wood he started with?

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2 answers
  1. x-2 = 5
    x = 7

    3x = 21

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  2. X-2=5
    ×=5+2 (change sign because you transpose -2 to the other side so that it will become +)
    X=7

    3 (x)=?
    3 (7) (the unknown or the is 7 👆 so that you have to subtitute it)
    3 (7)=21 ( the length of the piece of wood he started with 21 )

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