Which number makes this equation true?
(12 + 5) * 7 = (12 x 7) + (5 * __)

(c) 7
7×(12 + 5) = (7×12) + (7× 5)
Explanation:
Distributive property say that multiplication an division can be distributed over parenthesis.
a x (b+c) = a x b + a x c