Consider the following demand equation.

$x=(-\frac{7}{4})p+14$

Let $x=f(p),$ with price $p.$ Find $f^{\text{'}}(p).$

$f^{\text{'}}(p)=$

Find the elasticity of demand, $E(p).$

$E(p)=$

Compute the elasticity of demand and determine whether the demand is elastic, unitary, or inelastic at the price $=5.$

$E(5)=$