<human>:  Issac has to buy pens and pencils for the upcoming school year. Issac buys 108 writing utensils total. He buys 12 more than 5 times the number of pencils than pens. How many pens did Issac buy?
<bot>: Define a variable ** Let x be the number of pens bought
How many pencils did he buy? ** He bought 12+5x pencils
Set up an equation ** x+(12+5x)=108
Combine like terms ** 6x+12=108
Subtract 12 from both sides ** 6x=96
Divide by 6 ** x=<<16=16>>16 pens
#### 16