Stacy has 32 berries. Steve takes 4 of Stacy's berries, and still has 7 less berries than Stacy started with. How many berries did Steve start with?
Please answer the following question by reasoning step-by-step.
21
Let x be the number of berries Steve started with.

x + 4 = 32 - 7.

x + 4 = 25.

x = 21 berries.

.

The answer is 21