Solving for a variable in terms of other variables using addition or subtraction with division

a in terms of b:

a=2b

a in terms of c:

a=3c

b in terms of a:

a=2b

b = 0.5a

b in terms of c:

2b = 3c

b = 1.5c

c in terms of a:

a=3c

c=$\frac{1}{3}a$

c in terms of b:

$2b=3c$

$c=\frac{2}{3}b$