#4635 some aux method

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37533 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[cas] fix for NSolve[{3=c*a^5, 3=c*a^4},{a,c}]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37534 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix test Mike_1264 properly

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37535 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e