Answer:
No solution.
Explanation:
3x+11=3x-11 is not possible for any x.
Subtract 3x on both sides:
11=-11 is not true which means 3x+11=3x-11 is not true for any x.
If you graph y=3x+11 and y=3x-11, you should see the two lines are parallel and never intersect.
They both have slope 3 and the y-intercepts are 11 and -11 respectively.