Answer:
7
Explanation:
The parallel side of the equation is 38. Which means the side of the equation must be equal to that. Thats how parallelograms work.
So the equation 5x+3 can be broken down like this:
5(x)+3
5(7)+3 fill in number where variable was
5×7= 35 so the equation becomes
35+3 = 38
38=38
in the future just plug in each answer (the numbers) into the equation and use the process of elimation to find the answer :)