Chapter 2 - Solving Equations - 2-5 Literal Equations and Formulas - Practice and Problem-Solving Exercises - Page 112: 19

$x=\frac{p}{m+n}$

We are trying to isolate the variable $x$ in the equation $mx+nx=p$ To do this, first we will factor out the $x$ using the distributive property: $x(m+n)=p$ Then, we will divide by $m+n$ to isolate $x$: $x=\frac{p}{m+n}$