Answer:

Step-by-step explanation:
1) Simplify 1/3 ( x - 10) to x-10/3.

2) Multiply both sides by 3.

Simplify 4 × 3 to 12.

4) Add 10 to both sides.

5) Simplify -12 + 10 to -2.

So, therefor, the answer is, x = -2.
He bought 3 small notebooks (3*7=21) and 3 large notebooks (3*10=30)
21+30=51
9/2 or 4.5
hope this helps:)
<span>9.15E18 --- how we learn to write it</span>