7x + 3

7 + 3x

10 + 3x

7x + 21

3x + 8

x + 3

2x + 5

$x^3$ + 8

13 + 8x

8x + 33

8x + 20

17(2x + 5)

-6x + 12

6x - 12

-6x - 2

-6x + 2

(10 - 6) ÷ y and 10 - (6 ÷ y)

4 + (3 ⋅ y) and (4 + 3) ⋅ y

(18 ÷ y) + 10 and 10 + (y ÷ 18)

12 - (y ⋅ 2) and 12 - (2 ⋅ y)

6 ⋅ x + 3

6 ⋅ ( x + 3)

8 ⋅ 6 ÷ x

8 ⋅ x ÷ 6

9(6 + x)

9 ⋅ 6 + 9 ⋅ x

x + (8 ⋅ 9)

(x + 8) ⋅ 9

 $4\ -\left(5\ \cdot\ x\right)$  

 $4\ +\left(x\ \cdot5\right)$  

 $5\ +4\ \cdot x$  

 $5\ \cdot\left(x\ +4\right)$  

 $\left(8\ \cdot\ 4\ \div\ 5\right)\ +\ a$  

 $8\ +a\ \cdot\ \left(4\ \div\ 5\right)$  

 $\left(a\ +\ 8\right)\left(4\ \div\ 5\right)$  

None of the above