1. y + 6 = 20
subtract 6 from both sides
y = 14
2. x - 10 = 12
add 10 to both sides
x = 22
3. 12 + 2 = 15
false
4. 2 + n = 16
subtract 2 from both sides
n = 14
5. a + 4 = 14
subtract 4 from both sides
a = 10
6. m - 5 = 10
add 5 to both sides
m = 15
7. 4 + b = 30
subtract 4 from both sides
b = 26
8. 10 + c = 25
subtract 10 from both sides
c = 15
9. x - 60 = 20
add 60 to both sides
x = 80
10. 9 - 16 = 4
false
11. x - 15 = 20
add 15 to both sides
x = 35
12. w + 14 = 18
subtract 14 from both sides
w = 4
13. r - 18 = 27
add 18 to both sides
r = 45
14. 13 + k = 25
subtract 13 from both sides
k = 12
15. f - 16 = 34
add 16 to both sides
f = 50
I think you had some typos in there but I think this should get you started, you should be able to figure out the rest