1/2 + x = 5/6
x = 5/6 - 1/2
x = 2/6
x = 1/3
5/6 - x = 1/3
-x = 1/3 - 5/6
- x = 2/6 - 5/6
-x = -3/6
x = 3/6
x = 1/2
x - 1/5 = 3/10
x = 3/10 + 1/5
x = 3/10 + 2/10
x = 5/10
1/2 + x = 5/6
x = 5/6 - 1/2
x = 2/6
x = 1/3
5/6 - x = 1/3
-x = 1/3 - 5/6
- x = 2/6 - 5/6
-x = -3/6
x = 3/6
x = 1/2
x - 1/5 = 3/10
x = 3/10 + 1/5
x = 3/10 + 2/10
x = 5/10
x = 1/2