850d9846f85fb50a15010fbba117a297ce46475a
the expected result = 0. symmath_check() was dividing a quantity by the expected result, leading to a NaN value that caused the answer to be marked incorrect. Added test_symmath_check.py with basic tests for the symmath_check() function.
Remove the specific version of ruby here because it's breaking the dev scripts amongst other things.
See doc/ for documentation.
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