2.1.4 - Simplifying Expressions with Zero.gwb - 1/9 - Mon Sep 11 2017 07:58:54

2.1.4 - Simplifying Expressions with Zero.gwb - 2/9 - Mon Sep 11 2017 07:59:29

2.1.4 - Simplifying Expressions with Zero.gwb - 3/9 - Mon Sep 11 2017 08:00:22

2.1.4 - Simplifying Expressions with Zero.gwb - 4/9 - Mon Sep 11 2017 09:19:05

2.1.4 - Simplifying Expressions with Zero.gwb - 5/9 - Mon Sep 11 2017 09:23:10

2.1.4 - Simplifying Expressions with Zero.gwb - 6/9 - Wed Sep 13 2017 08:57:37

2.1.4 - Simplifying Expressions with Zero.gwb - 7/9 - Wed Sep 13 2017 08:02:22

2.1.4 - Simplifying Expressions with Zero.gwb - 8/9 - Mon Sep 11 2017 08:00:57

2.1.4 - Simplifying Expressions with Zero.gwb - 9/9 - Mon Sep 11 2017 08:01:05