题目不等式组{−x+2＜2x−7x＞a\left\{\begin{array}{l}{-x+2＜2x-7}\\{x＞a}\end{array}\right.{−x+2＜2x−7x＞a的解集是x>3x \gt 3x>3,那么α\alphaα的取值范围是______.知识点：不等式的解集章节：方程与不等式 / 不等式与不等式组
