Question

26-17+15

Answer 1

http://www.google.com/search?q=geosphere&rlz=1C1AVSX_enUS414US423&oq=geosphere&aqs=chrome..69i57j0l5.2450j0j8&sourceid=chrome&espv=210&es_sm=122&ie=UTF-8#es_sm=122&espv=210&q=26-17%2B15