How would you solve this using a chart?

Question

Rodney sold twice as many cars as Greg. In April, Rodney sold 5 fewer cars than he did in March, whereas Greg sold 3 more cars than he did in March. If they sold the same number of cars in April, how many cars did each sell in March?

Answer 1

Greg in march = x
Rod in March = 2x

Rod in April = 2x-5
Greg in April = x + 3

so
2x - 5 = x + 3
x = 8
2x = 16

Answer 2

Thank you!