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13 November, 19:46

9 + b = - 12

q + (-9) = 12

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Answers (1)
  1. 13 November, 21:51
    0
    Subtract 9 from both sides

    b = - 12 - 9

    simplify - 12 - 9

    Answer: b = - 21

    9 + - 21 = - 12 is true.

    simplify brackets

    simplify q + - 9 to q - 9

    add 9 to both sides

    simplify 12 + 9 to 21

    q = 21

    21 + - 9 = 12 is true.
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