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18 September, 00:55

Solve for a in the problem:

-3 (9a+2) = 129

+5
Answers (2)
  1. 18 September, 02:39
    0
    Answer: a = - 5

    Step-by-step explanation:

    -3 (9a+2) = 129

    -27a - 6 = 129

    -27a = 129+6

    -27a = 135

    a = - 135/27
  2. 18 September, 03:06
    0
    a = - 5

    Step-by-step explanation:

    To solve the equation, we want to find out what a is. In order to do this, we have to get a by itself. Perform the opposite of what is being done to the equation. Keep in mind, everything done to one side, has to be done to the other.

    -3 (9a+2) = 129

    -3 is being multiplied by 9a+2. The opposite of multiplication is division, so divide both sides by - 3.

    -3 (9a+2) / -3=129/-3

    9a+2=129/-3

    9a+2=-43

    2 is being added on to 9a. The opposite of addition is subtraction, so subtract 2 from both sides.

    9a+2-2 = - 43-2

    9a = - 43-2

    9a = - 45

    a is being multiplied by 9. The opposite of multiplication is division, so divide both sides by 9.

    9a/9 = - 45/9

    a = - 45/9

    a=-5
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