Gavin likes biking. He never misses a chance to go for a ride when the weather is nice. This week his goal is to bike about 65 total miles over four days. Each day, he wants to ride 1.5 times as far as he rode the day before. How far should he ride on each of the four days to reach his goal? Because his goal is to bike 65 miles over four days, what equation can be used to find the number of miles he should bike on the first day, x? Do not combine like terms.