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b. (x⁷y²)³ / (x²)⁴ = x²¹y⁶ / x⁸ = x²¹y⁶/x⁸ = x²¹⁻⁸y⁶ = x¹³y⁶
b). (x^7 y^2)^3 : (X^2)^4 = (x^21 y^6): X^8 = x^13 y^6