Answer: 5 9/10
Step-by-step explanation: First, you subtract 7 and 7/10, and then the difference minus 2/5, to make equal denominators, you have to multiply 2 to the numerator and the denominator, and then subtract and the new difference should be 5 9/10.
Work: 7 - 7/10 = 6 3/10 -4/10= 5 9/10