4-7 transforming equations help

Virtual Lesson:
transforming_equations_lesson
transforming_equations_lesson_part_2_(short)

Todays examples:
alg 4-7 prob 5 9 and 9b
alg 4-7 prob 15
alg 4-7 3 17 19

Last years examples:
algebra 47 13 - 19 odds
algebra 4 7 prob 23 to 27 mr 3