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9 September, 07:52

Find r if 3 (r - 7) = 4 (2 - 2r) + 4

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Answers (2)
  1. 9 September, 08:06
    0
    r=3

    Step-by-step explanation:

    3 (r - 7) = 4 (2 - 2r) + 4

    Distribute

    3r - 21 = 8 - 8r + 4

    Combine like terms

    3r - 21 = 12 - 8r

    Add 8r to each side

    3r + 8r-21 = 12 - 8r+8r

    11r - 21 = 12

    Add 21 to each side

    11r - 21+21 = 12+21

    11r = 33

    Divide each side by 11

    11r/11 = 33/11

    r = 3
  2. 9 September, 08:06
    0
    Step-by-step explanation:

    3 (r - 7) = 4 (2 - 2r) + 4

    3r + (-21) = 8 + (-8r) + 4

    -21+8+4=3r + (-8r)

    -9=-5r
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