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15 July, 15:10

78 = - 2 (m + 3) + m

a) - 42

b) - 72

c) - 84

d) - 28

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Answers (2)
  1. 15 July, 16:10
    0
    c

    Step-by-step explanation:

    distribute the parenthesis and simplify

    78 = - 2m - 6 + m

    78 = - m - 6 (add 6 to both sides)

    84 = - m (multiply both sides by - 1)

    - 84 = m ⇒ m = - 84 → c
  2. 15 July, 16:20
    0
    78 = - 2m-6+m

    78 = - m-6

    78+6 = - m

    84 = - m

    m = - 84 Answer (C)
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