Question

Solve:
9(30 + a) = 99
a =

Answer 1

9(30+ a) = 99
270+ 9a= 99
- 99 -99

171=9a
_ _
9 9

19= a

Answer 2

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!