(y^7)^4 y^5 / y^10 = y^(74) y^5 / y^10 = y^28 y^5 / y^10 = y^(28+5) / y^10 = y^33 / y^10 = y^(33-10) = y^23
(y^7)^4 y^5 / y^10 = y^(74) y^5 / y^10 = y^28 y^5 / y^10 = y^(28+5) / y^10 = y^33 / y^10 = y^(33-10) = y^23