<http://webisa.webdatacommons.org/prov/57974921>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/180289451> .
<http://webisa.webdatacommons.org/180289451>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/180289451>	<http://www.w3.org/ns/prov#value>	"Why bother changing the variable, when there is a direct formula for solving the equation?" .
<http://webisa.webdatacommons.org/180289451>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stackexchange.com> .