Welcome to Android Central! The J7 does not support MHL (which is the adapter cable that can connect compatible devices to a TV's HDMI port via the microUSB port). Your best bet is a Chromecast.
How does Chromecast work
With my Samsung note 2 I could enable screen mirroring and beam my mobile phone screen to my hdtv with the help of the Microsoft P3Q- 00001 plugged into the HDMI port and the usb port. No wifi needed. But my Samsung J7 2016 doesn't seem to have miracast or screen mirroring. Am i just screwed? Any suggestions for mirroring my mobile phone screen to my tv without wifi?