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26 March, 09:43

Solve the equation 3 (x-7) - x=2x-21

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Answers (2)
  1. 26 March, 11:17
    0
    3 (x - 7) - x = 2x - 21

    Distribute the the 3: 3x - 7 - x = 2x - 21

    Add like terms: 4x - 7 = 2x - 21

    Subtract 2x on both sides: 2x - 7 = - 21

    Add - 7 to both sides: 2x = - 28

    x = - 14
  2. 26 March, 13:43
    0
    First, distribute

    3 (x-7) = 3x-21

    3x-21-x=2x-21

    3x-1x-21=2x-21

    add like terms

    2x-21=2x-21

    minus 2x oth sides

    -21=-21

    true

    we see that the x's wil cancel

    therfor x=all real numbers
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