Explanation:
the domain is the interval or set of all valid x-values (the range is the interval or set of all valid y-values).
for a fraction to be valid the denominator (bottom part) must not be zero.
that means for
h(x) / g(x)
we must exclude the value(s) for x that make g(x) = 0.
g(x) = 5x - 7
0 = 5x - 7
5x = 7
x = 7/5 = 1.4
since g(x) is a linear function (the highest exponent of x is 1), we have only one zero solution (1.4).
therefore, 1.4 is the only value that is not in the domain of h(x) / g(x).