13.
解不等式组$\left\{\begin{array}{l}{3x+1<7}\\{2(x+1)-1≤3x+2}\end{array}\right.$,将解集在数轴上表示出来,并写出它的非负整数解.
0 287736 287744 287750 287754 287760 287762 287766 287772 287774 287780 287786 287790 287792 287796 287802 287804 287810 287814 287816 287820 287822 287826 287828 287830 287831 287832 287834 287835 287836 287838 287840 287844 287846 287850 287852 287856 287862 287864 287870 287874 287876 287880 287886 287892 287894 287900 287904 287906 287912 287916 287922 287930 366461