Question

Solve for c.

3abc + b = 5

c = (5 - b)/(3ab)
c = -5/3ab
c = 2 - ab

Answer 1

3abc + b = 5
3abc = 5-b
c = (5-b)/(3ab)

Your answer is c = (5-b)/(3ab); i.e.,option A

Answer 2

$3abc + b = 5 \\ (3ac + 1)b = 5 \\ 3ac + 1 = \frac{5}{b} \\ 3ac = \frac{5}{b} - 1 \\ c = ( \frac{5}{b} - 1) \frac{1}{3a} \\ c = ( \frac{5 - b}{b} ) \frac{1}{3a} \\ c = \frac{5 - b}{3ab}$