Find the common factors of the given term.
12x, 36
∵ 12x = 2 × 2 × 3 × x = (2 × 2 × 3) × x
and 36 = 2 × 2 × 3 × 3 = (2 × 2 × 3) × 3
∴ the common factor = 2 × 2 × 3
= 12