Answer:
c = b/(a - 1)
Explanation:
Solve for c:
-1 + 3 a - b/c = 2 a
Bring -1 + 3 a - b/c together using the common denominator c:
(-b - c + 3 a c)/c = 2 a
Multiply both sides by c:
-b - c + 3 a c = 2 a c
Collect in terms of c:
c (3 a - 1) - b = 2 a c
Subtract 2 a c - b from both sides:
c (a - 1) = b
Divide both sides by a - 1:
Answer: c = b/(a - 1)