The answer to this question is 11.43.
In order to do this, first subtract 6 from both sides of the equation.
6 + 7x = 86
-6 -6
7x = 80
Next, divide 7 on both sides. You should end up with 11.42857142....
Lastly, round to get the closest answer which will be 11.43.
Hope this helps! :)
