Answer: We can simplify the left side of the equation as follows:
7×10^0 - 3×10^-1 = (7/1)×10^0 - (3/10)×10^0 = (7-0.3)×10^0 = 6.7×10^0
Substituting this into the given equation, we get:
6.7×10^0 = k×10^0
Dividing both sides by 10^0, we get:
k = 6.7
Therefore, the value of k that satisfies the given equation is 6.7.