@Markiyan Hirnyk So, I can not find its real root as a fraction??

Also, when I found this real root ( -2.326878748 ) and convert it using convert (-2.326878748,rational)

it gaves me (-5047/2169)

But -5047/2169 = -2.326878746 and not -2.326878748 !!

so, what do you say about that?!

@acer

@Markiyan Hirnyk

@Kitonum

Thanks for your help, really I am grateful for you guys.

Can I ask you an other question plz...

How to solve the above equation in fractions?

I mean that I want the answer in fractional form