Simple Math

Find x to get the correct operation.
New concept, new experience.
Have fun and good luck!

*** License of resouces in app ***
App using resoure from iconfinder.com and freesound.org.
You can find licenses at "http://creativecommons.org/licenses/by/3.0/"
"http://opensource.org/licenses/MIT", "http://freesound.org/help/tos_web/"
and "http://support.iconfinder.com/customer/portal/topics/417141-licenses/articles".