Remove the Symbols of Grouping, and Simplify $(2 x+3)\left(4 x^{2}-6 y+9\right)-(2 x-3)\left(4 x^{2}+6 y+9\right)$

Short Answer

Remove the symbols of grouping, and simplify: $(2 x+3)\left(4 x^{2}-6 y+9\right)-(2 x-3)\left(4 x^{2}+6 y+9\right)$