By interchanging the given two numbers / not digits) which of the following equation will be not correct?

7 and 3

A

$$8 \div 2 + 9 \times 3 - 7 = 64$$

B

$$9\times 7 + 3 - 4 \div 2 = 32$$

C

$$7 + 3\times 8 - 8 \div 2 = 55$$

D

$$7\times 8 - 9 + 3 \div 1 = 30$$