A balanced lever has two weights on it, the first with mass #14 kg # and the second with mass #29 kg#. If the first weight is # 3 m# from the fulcrum, how far is the second weight from the fulcrum?
As a roule of thumb consider the ratio of masses;
in this case you can compare the masses and see if there is a relation between them: in this case one is twice the other so the distance should be half.
In your case (to be more precise) you can consider the resultant of the torques: