## Elementary Algebra

$\left\{-2, 2\right\}$
Divide $6$ on both sides to obtain: $n^2=4$ Subtract $4$ to both sides to obtain: $x^2-4 = 0$ Factor the difference of two square to obtain: $(x-2)(x+2)=0$ Equate each factor to 0 to obtain: $x-2=0 \text{ or } x+2=0$ Solve each equation to obtain: $x=2 \text{ or } x=-2$ Therefore, the solution set is $\left\{-2, 2\right\}$.