First, let's simplify the left side of the equation:

(32 + 17) ÷ 7 = 49 ÷ 7 = 7

Now, let's simplify the right side of the equation:

(12x + 1) • 7 = 12x • 7 + 1 • 7 = 84x + 7

Since the equation is equal, we can set them equal to each other:

7 = 84x + 7

Subtract 7 from both sides:

0 = 84x

Divide both sides by 84:

0/84 = x

x = 0

Therefore, the answer is A) 0.