SoftBank Corp.'s group company controlling Yahoo Japan Corp. and major messaging app provider Line Corp. are considering merging their operations by the end of 2020, sources familiar with the matter said Saturday.Yahoo Japan operator Z Holdings Corp. under SoftBank, a mobile phone unit of SoftBank Group Corp., and Line will announce their merger plan possibly next week, the sources said.SoftBank and Line hope to expand their internet businesses including online retailing, advertising and mobile phone services, the sources said.In fiscal 2018 through March, Z Holdings posted group sales of 9…READ FULL ARTICLE