## Algebra 1: Common Core (15th Edition)

In set-builder notation, the solutions are given by ${n | n \gt -3 }$.
Write: $9 - 4n \gt 21$ Subtract 9 from each side. $9 - 9 - 4n \gt 21 -9$ Simplify: $- 4n \gt 12$ Divide each side by 4: $-n \gt 3$ Then $n \gt -3$. In set-builder notation, the solutions are given by $\{n | n \gt -3 \}$.