Answer:
28j+21
Step-by-step explanation:
remember to isolate the variable. in this case it would be j. after you do that it should be pretty simple
Here is the link to the graph. You can scale it and tweak it.
https://www.desmos.com/calculator/mawkflj9ws
Hope this helped!
3 6 7 4
+ 6 7 8 9
~~~~~~~
10 4 6 3