(3/5)ˣ × (3/5)⁶ = (3/5)²ˣ⁻¹ what is the value of x

(3/5)ˣ × (3/5)⁶ = (3/5)²ˣ⁻¹ what is the value of x
B: 1
C: -1
D: None of these

The key says −1; standard manipulation