<human>:  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?
<bot>: Define a variable ** Let x be the number of berries Steve started with
Set up an equation ** x+4=32-7
Combine like terms ** x+4=25
Subtract 4 ** x=<<21=21>>21 berries
#### 21