Find the value of a in the following equations if b is 5:

a - 23 = b

a =

5a – 15 = b

a =

3a + b = 20

a =

Find the value of c in the following equations if a is 8:

2c-a = 80

c =

10a = 60 + c

c=

c ÷ 2 = 2a + 20

c =

Find the value of b in the following equations if c is 12:

6b = c

b =

b ÷ 2 = 5c

b =

6 + 3b = 8c

b =