The result should be 4 if it’s using PEMDAS
I think it's 42 since 7x6=42
The 4 is the tenth million place
13-3/2 you need to make a common denominator, so
26/2-3/2 then subtract the numerators, the denominator remains.
23/2 now simplify the fraction
11½ this is because 22/2+1/2=23/2, and 22/2=11, so 11+1/2 or 11½
The answer to that is x=8