## Algebra 1

$\{d\ |\ d\leq-7\}$
Solve the inequality. $7-3d\geq28\longrightarrow$ subtract 7 from each side $7-3d-7\geq28-7\longrightarrow$ subtract $-3d\geq21\longrightarrow$ divide each side by -3; flip the inequality $-3d\div-3\leq21\div-3\longrightarrow$ divide $d\leq-7$ The solution is written in the criteria area of the set-builder notation.