(2m-3n)^3 = (2 × m)^3 - 3 × (2 × m)^2 × 3 × n + 3 × 2 × m × (3 × n)^2 - (3 × n)^3 = 8 × m^3 - 36 × m^2 × n + 54 × m × n^2 - 27 × n^3
