Frigidaire dryer FDEB23RG, appears to have basic controls, if used an average of 3 times per week I was showing a retail of around $300-400...... $175 if ran 5 or more times per week $75.
Frigidaire washer FWXB45RG, Has about the most options You'll see on this brand same with dyer if used average of 3 times per week retail of $500 ......... $250 if 5 or more times per week $100.
Also make reductions for apparent rust this can be a sign of internal rust which would shorten the expected life span.
With an average usage of around 10 years these are 6+ You can expect to get around 4 more years of service which is a little less than half of its average life.
Let me know if You would like more Info.