If [math]x ^ 2 + x = 5[/math], the what is the value of [math](x + 3) ^ 3 + \frac{1}{(x + 3) ^ 3}[/math]?
What is the value of [math]x[/math] if [math]4^{x}-3^{x-\frac{1}{2}} =3^{x+\frac{1}{2}}-2^{2x-1}[/math] ?