Start "Vergelijkingen - Moderne Wiskunde" chapter exercises
Correctly generate question for 'Formules korter' exercise
Data-ensure at a single place
Use internal expressions library to represent equations
Add '=' as a commutative operator
First problem of "Formules korter" chapter implemented
Added other 'Formules korter' exercise
Various cleanups in 'Formules korter' exercise
First version of chapter 9-4 'Links en rechts hetzelfde'
Chapter 9-4 finished
Omslagpunt exercise added
Start with Pijlenketting exercise
Randomized variables for the Pijlenketting
Split up multiplication and addition
Fixes in the Pijlenketting exercise
Added colors to Pijlenketting exercise
Update the arrowchain itself in the Pijlenketting exercise
Added 'balans' problem to Pijlenketting exercise
Pijlenketting formatting and commenting
Prevent 1 from being a coefficient in the Balans exercise