How much do you need to subtract from 77/10 to make 7

Ataxi company charges $2.25 for the first mile and then $0.20 per mile for each additional mile, or f = $2.25 + $0.20(m - 1) where f is the fare and m is the number of miles. if juan's taxi fare was $6.05, how many miles did he travel in the taxi? if juan's taxi fare was 7.65, how many miles did he travel in taxi

Don't know how to find x given these segment lengths

What is the value of x in the following equation? -3x-2=2x+8