Question

1) 7+a=15 2) 23=d+44 3) 28=n-14 4) T-22=-31

Answer 1

Hi, I'd be glad to help. 

1) a = 8

2) d = (-21) 

3) n = 42

4) t = (-9)

Answer 2

1.7+a=15
subtract 7
a=8
2. 23=d+44
subtract 44
-21=d
3. 28=n-14
add 14 
n=42
4.T-22=-31
add 22
t= -9