human
Convert the given word problem into an equation.
Input:
Sophie read three books this week. She read twice as many books the week before. How many books did she read the week before?
gpt
Let x = the number of books Sophie read the week before. 
The equation to represent the problem is:
x = 2*3   (She read twice as many books the week before, which is two times the 3 books she read this week)
alpaca_gpt4_data_41288