(3⁻² ⋅ 5⁻³) / 15⁻³

(3⁻² ⋅ 5⁻³) / 15⁻³ = (3⁻² ⋅ 5⁻³) / (3⁻³ ⋅ 5⁻³) = 3⁻²⁻⁽⁻³⁾ = 3¹ = 3