they are alternate exterior angles so they have the same amount degree angle. also look at the location of the rest of the problems and see they are on opposite sides but in the same place and they have the same degree. itll be the same for this problem.
the answer is x=24
by cross multiplying 4/5 and x/30, we get 5x= 120. divide 120 by 5, and you get 24.
1. you need to isolate x by adding 3/4 to 2 4/5
2. you need to isolate x so add 11 to -20 and then divide that answer by -1/3
3. add 12 to -19 then divide that answer by 5/7