1.2a+8 =16 2.3a+4 =a 3.5-5a =10 4.2x+15 =27

1]
2a + 8 = 16
2a = 16 - 8
2a = 8
a = 8/2
a = 4

2]
3a + 4 = a
3a - a = - 4
2a = - 4
a = - 4/2
a = - 2

3]
5 - 5a = 10
- 5a = 10 - 5
- 5a = 5
a = 5/(-5)
a = - 1


4]
2x + 15 = 27
2x = 27 - 15
2x = 12
x = 12/2
x = 6