## Algebra 1

$a=3$
$2a+5=9a-16\longrightarrow$ subtract 2a from each side; add 16 to each side $2a+5-2a+16=9a-16-2a+16\longrightarrow$ combine like terms $21=7a\longrightarrow$ divide each side by 7 $21\div7=7a\div7\longrightarrow$ simplify $3=a$