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algebra

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1. a number increased by 21 is 28. find the number

2. a number decreased by 12 is equal to 30. find the number.

3. 8 less than a number is 15. fid the number

  • algebra -

    Let x = the unknown number.

    x + 21 = 28
    x + 21 - 21 = 28 - 21
    x = 7

    x - 12 = 30
    x = ?

    How do you think you should set up the third problem?

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