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23 August, 20:29

Solve:

9 (30 + a) = 99

a =

+2
Answers (2)
  1. 23 August, 20:38
    0
    Hello,

    Example,

    2 (x+3) = 12x

    We divide with 2 at everywhere.

    2 (x+3) / 2=12x/2

    x+3=6x

    Now x, be - x.

    3=6x-x

    3=5x

    Wè divide with 5.

    3/5=5x/5

    3/5=x

    Answer the questions.

    9 (30+a) = 99

    We divide with 9.

    9 (30+a) / 9=99/9

    30+a=11

    Now 30, be - 30.

    a=11-30

    a = (-19)

    #Tr

    Good lessons!
  2. 23 August, 20:43
    0
    9 (30 + a) = 99

    270 + 9a = 99

    - 99 - 99

    171=9a

    _ _

    9 9

    19 = a
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