solve for c.\n21 = \\frac{5}{6}c - 9

Explanation:

Step1: Add 9 to both sides

$21 + 9=\frac{5}{6}c-9 + 9$ $30=\frac{5}{6}c$

Step2: Solve for c

$c = 30\div\frac{5}{6}$ $c=30\times\frac{6}{5}$ $c = 36$

Answer:

$c = 36$