Question:

Which of the following equations are equivalent to -2m - 5m - 8 = 3 + (-7) + m?

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-15m = -4m

-7m - 8 = m - 4

-3m - 8 = 4 - m

m - 4 = -7m - 8

-8 - 7m = -4 + m

-8 - 3m = 4 - m

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5 ANSWERS


  1. -7m - 8 = m - 4


  2. -2m - 5m - 8 = 3 + (-7) + m

    Add or subtract like terms leaving...

    -8 - 7m = -4 + m

  3. You are combining like terms

    (-2m - 5m) - 8 = (3 - 7) + m

    -2m - 5m = -7m

    3 - 7 = -4

    So

    -7m - 8 = -4 + m

  4. -2m - 5m - 8 = 3 + (-7) + m

    -7m - 8 = 3 - 7 + m

    -7m - 8 = -4 + m

    -7m - 8 = m - 4

  5. -7m - 8 = -4 + m

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