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22 December, 08:59

3c+-9=18 I don't know how to do this problems

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Answers (2)
  1. 22 December, 09:49
    0
    3c+-9=18

    +-=-

    3c-9=18

    move 9c to the other side and the sign changes from negative to positive.

    3c-9+9 = 18+9

    3c = 27

    Divide by 3

    c=9
  2. 22 December, 10:02
    0
    3 because you have to add - 9 to 18 then divide 3c by tht answer
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