Answer:
[tex]x = \frac{r - 2y}{3}[/tex]
Step-by-step explanation:
3x + 2y = r
-2y -2y
3x = r - 2y
Now that 2y has been subtracted from both sides you can isolate the variable. To do that you would divide both sides by 3.
[tex]x = \frac{r - 2y}{3}[/tex]
Hope that helps and have a great day!