In Xiaoming's mid-term exam, the math score was 9 points higher than the average score of language, mathematics, and English, and the Chinese score was 7.5 points lower than the average score of language, mathematics, and English. So how much higher is Xiaoming's math score than his English score?
小明期中考试，数学分数比语、数、英三门的平均分高9分，语文分数比语、数、英三门的平均分低7.5分．那么小明的数学分数比英语分数高多少分？
<result>10.5</result>