## Algebra 1

$5d+6-3d=12\longrightarrow$ combine like terms $2d+6=12\longrightarrow$ subtract 6 from each side $2d+6-6=12-6\longrightarrow$ subtract $2d=6\longrightarrow$ divide each side by 2 $2d\div2=6\div2\longrightarrow$ divide $d=3$