If $\bigstar + \bigstar + \bigstar + \bigstar = 43.56$ and $\blacktriangledown + \bigstar + \bigstar = 23.68$ then $\bigstar - 3 \times \blacktriangledown = ?$

Question

(A) 7.09 (B) 5.29 (C) 5.19 (D) 6.49