Human: Carver just turned 45 years old, which makes him 5 years less than twice the age of his son. How old is his son, in years? Assistant: 
Define a variable ** Let x be the age of Carver's son.
How old is Carver? ** Since Carver's age (45) is 5 years less than twice the age of his son, then 45=(2*x)-5.
How old is Carver? ** Add 5 to each side of the equation and we get 50=2*x.
How old is Carver's son? ** Thus, the age of Carver's son is x=25 years old.
#### 25