## Algebra 1

$-9\lt 3m+6\leq18\longrightarrow$ subtract 6 from each part $-9-6\lt 3m+6-6\leq18-6\longrightarrow$ subtract $-15\lt 3m\leq12\longrightarrow$ divide each part by 3 $-15\div3\lt3m\div3\leq12\div3\longrightarrow$ divide $-5\lt m\leq4$ A parenthesis indicates that -5 is not included in the solution set, while a square bracket indicates that 4 is included in the solution set.