A sofa is on sale for $429 which is 34% less than the regular price. What is the regular price?

Let x be the regular price of the sofa.

34% of x is equal to x - $429.

0.34x = x - $429

0.66x = $429

x = $429 / 0.66

x = $650

Therefore, the regular price of the sofa is $650.