Simplify

1. Expand the bracket, taking care of the negative multiplier.

$5 - 2(6x - 1) = 5 - 12x + 2$

2. Collect the constant terms.

$5 - 12x + 2 = 7 - 12x$

1. Use the negative index to write the reciprocal with a positive fractional index.

$\left(\dfrac{27b^9}{a^6}\right)^{-1/3}=\left(\dfrac{a^6}{27b^9}\right)^{1/3}$

2. Apply the cube root to the numerator and denominator.

$\left(\dfrac{a^6}{27b^9}\right)^{1/3}=\dfrac{(a^6)^{1/3}}{(27b^9)^{1/3}}=\dfrac{a^2}{3b^3}$