# Lesson 106 – Doodles Do Algebra

Today’s lesson is subtracting algebraic fractions and it is just like adding fractions, only you have to keep track of the negative signs.

1. $5a/10-2a/10=3a/10$
2. $10x/15-9x/15=x/15$
3. $(x+y-(x-y))/3=2y/3$
4. $9a/12x-8a/12x=a/12x$
5. $((x+y-(x-y))/((x-y)(x+y))=2y/(x^2-y^2)$