Let's first solve the first equation:

$4\times b-16$/2=10
2$4\times b-16$=10
8×b-32=10
8×b=42
b=5.25

Now, let's plug in the value of b into the second equation:

$2+5.25$/7×8=72
7.25/7×8=72
1.0357×8=72
8.2856=72

Therefore, the value of x is approximately 8.29.