Remove ''LR'' from display on calc.?

Hello,
I am sorry but I do not quite understand by the LR showing in the display.
For the FX-115ES, the only instance where the L and R appear is in the solutions screen.
When you use the Solve( function, the calculator searches for the solution. When the solution is found, the screen displays
(actual exemple)

Y=3*X^2-2
X= 0.8164965809
L-R = 0.
The L-R =0, shows that the precision of the solution, Left member -Right member =0.

To clear the screen you press [AC].
Hope it helps.