24 less than six times a number is the same as 21 more than the number

Tan198=asin164=? how to solve this? ?

Will mark brainliest! ( explain the answer too, it can be one sentence)

Jared had 3/7 of the minutes on a family phone plan remaining for the month. the plan is shared by 2 people. if divided equally what portion of the minutes remaining on the phone plan would be avalible for each person