Answer:

A) The equation 2 - 3 = 7 is not correct; there is no solution.

B) 5/7 + 1/4 = 27/28.

Answer:

A. 2-3=7

2=7+3

2=10

10-2

8 is answer

B. 5/7+1/4=5

4,7 LCM is 28

20+7/28=5

27/28=5