Answer:

Step-by-step explanation:
n is doubled: 2n
y added: 2n + y
divided by 2: n + 
n subtracted -> final resutl: 
You subtract 5 to the other side so it'll read -6n=-4 then divide -6 to the other side and it'll be 2/3
Answer:
y = 30° { adjacent angles }
z = 90 - 30° = 60° { right angle triangle - 90° }
x = 180° - 60° - 60° = 60° { isosceles, triangle has two sides 60° }