Answer:
Step-by-step explanation:
Hi. First off, welcome to brainly, i see this is your first question. Hope I make a good first impression!. As for your problem:
You're going to want to set it up like this:
3.5x+7=42.
You're looking for the number of movies rented, which will be your variable
Subtract 7 from both sides
3.5x=35
and divide by 3.5 on both sides
x=10
So you rented 10 movies for the month