X= 4.8 or x= 4 4/5 i believed
You can you 72 which would make 2/8 18/72 and 3/9 24/72 which makes the sum 42/72.
You can consider the triangle (as on in the picture) and apply to it composition of two transformations:
1. reflection about the line y=x to form ΔA'B'C' and translation 1 unit right and 5 units up to form ΔA''B''C'';
2. translation 1 unit right and 5 units up to form ΔA'B'C' and reflection about the line y=x to form ΔA''B''C''.
You can see that results are different.
On added picture blue colour responds to composition of transformations 1 and red colour to composition of transformations 2.
You can round 15 to 20, and 8 to 10