## Elementary Algebra

$x=-\dfrac{25}{4}$
Using the properties of equality, the value of the variable that satisfies the given equation, $-16-4x=9 ,$ is \begin{array}{l}\require{cancel} -4x=9+16 \\\\ -4x=25 \\\\ x=\dfrac{25}{-4} \\\\ x=-\dfrac{25}{4} .\end{array}