SAT Question 79cf8505: Linear Equations In One Variable answer and explanation with Desmos solution

It's given that a line segment has a length of $115$ cm and is divided into three parts, where one part is $47$ cm long and the other two parts have lengths that are equal. If $x$ represents the length, in cm, of each of the two parts of equal length, then the equation $47+x+x=115$, or $47+2x=115$, represents this situation. Subtracting $47$ from each side of this equation yields $2x=68$. Dividing each side of this equation by $2$ yields $x=34$. Therefore, the length, in cm, of one of the two parts of equal length is $34$.