Greatest common factor of the two terms namely 72x⁶y⁷ and - 96x⁷y⁶ of expression 72x⁶y⁷ - 96x⁷y⁶ is 24x⁶y⁶

72x⁶y⁷ = 24x⁶y⁶ (3y) and - 96x⁷y⁶ = 24x⁶y⁶(-4x)

72x⁶y⁷ - 96x⁷y⁶ = 24x⁶y⁶ (3y - 4y)