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".