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How do i solve <span title="this??????????????????????">this?????????????????????...</span>

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5x+21-7x=81

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  1. 5x+21-7x=81

    -2x=60

    x= -30


  2. 5x+21-7x=81

    5x - 7x = 81 - 21

    -2x = 60

    x = 60/-2

    x = -30

  3. 5x + 21 - 7x = 81

    Gather like terms

    5x -7x + 21 = 81

    -2x +21 = 81

    -2x + 21 - 21 = 81 - 21 (do the same operation to both sides)

    -2x = 60

    -2x * -1 = 60 * -1 (do the same operation to both sides)

    2x = - 60

    2x/2 = - 30/2 (yep, do the same operation to both sides)

    x = -30

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