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9 December, 08:59

3x + 1 + 5x = 7 + 15 + 7x

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Answers (2)
  1. 9 December, 09:01
    0
    Combine like terms on each side of the equation ...

    8x+1=7x+22 subtract 1 from both sides

    8x=7x+21 subtract 7x from both sides

    x=21
  2. 9 December, 09:25
    0
    3x + 1 + 5x = 7 + 15 + 7x

    Move unknown terms to the left of the equal with changed sign and the known terms to the right of the equal with changed sign.

    3x + 5x - 7x = 7 + 15 - 1

    x = 21
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