remove debug code

and adding missing semicolon
may related to #129200
Add a message saying select all that apply
Remove need for simplified fractions
Remove simplification hint
Remove simplification step entirely
Bug fix for GH-129388. Fix incorrect hint
Fix GH-129394 - Fix instructions text for parallel
removed some unused code
revert (commit of wrong file/removed used code)
removed some unused vars
removed some unused vars
Merge pull request #129440 from richard-to/bugfix129388

Bug fix for GH-129388. Fix incorrect hint
Merge pull request #129448 from richard-to/bugfix129394

Fix GH-129394 - Fix instructions text for parallel
Merge pull request #129598 from mauk81/cleanup

removed some unused code
Merge pull request #129256 from mauk81/patch-2

remove debug code
check tool properties properly, fix #128902
Finish hints
Change equivalent to equal
Merge pull request #130898 from petercollingridge/parallelperp

Change word "equivalent" to "equal"

Test Plan: none

Auditors: eater
Add knumber and equality to kmath

Summary:
Adds
k*.equal
kvector.colinear
kvector.negate
knumber.equal
knumber.sign

Test Plan: New unit tests

Reviewers: alex

Reviewed By: alex

CC: alpert

Differential Revision: http://phabricator.khanacademy.org/D5443