Add simplifying rational expression 2
Accept answers where numerator and denominator are both multipled by -1
Improve function for writing expressions.
Add a y = to the question
Fix regex so it doesn't capture just part of the answer
Change name to simplifying rational expression 3 so I can make a different set of slightly easier exercises
Merge remote-tracking branch 'upstream/master' into rational-expr
Improve hints when denominator is 1 or -1.
Switch to using expressions.js library
Remove debugging again
Combine regex functions into a single function
Start simplifying rational expressions 2
Make expression.js play nicely with terms that evaluate to 0
Simplfy filtering of 0s
Fix to use just one multiplier
Fix hints (nearly)
Fix regex
Fix regex with 0 coefficent and hints with negative denominator
Make power function work nicely with powers of 0 or 1
Expand questions to include factor with powers of a variable