\(\left(2x-\dfrac{2}{3}xy\right)\left(-6x^2\right)\\ =-12x^3+4x^3y\)
`(2x-2/3xy)(-6x^2)`
`=[2x.(-6x^2)]+[-2/3xy. (-6x^2)]`
`=-12x^3+4x^3y`
\(\left(2x-\dfrac{2}{3}xy\right)\left(-6x^2\right)=\left(-6x^2.2x\right)-\left[-6x^2.\left(\dfrac{2}{3}xy\right)\right]\)
\(=-12x^3+4x^3y\)