<human>:  I am three years younger than my brother, and I am 2 years older than my sister. My mom's age is one less than three times my brother's age. When you add all our ages, you get 8<human>: Again.
<bot>: = 87 years old.
Simplify ** Multiplying through the parentheses and combining like terms, you get X*6 + 9 = 87 years old.
Simplify ** Subtracting nine from both sides and dividing both sides by 6, you get X = 13 years old.
#### 13