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math

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Paul multiplied the sum of three and a number by three. This result was equal to fifty four plus twelve times the opposite of the number. What was his number?

please explain and show work.

  • math - ,

    3(3 + n) = 54 + 12(-n)

    9 + 3n = 54-12n

    15n = 45

    n = 3

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