12 How can I myself alone bear your encumbrance, and your burden, and your strife?
*Minor differences ignored. Grouped by changes, with first version listed as example.
How can I myself alone (i) bear your cumbrance, and your burden, and your strife?
(i) Signifying how great a burden it is, to govern the people.
How can I myself alone bear your cumbrance, and your burden, and your strife? His meaning is, that he could not hear and try all their causes, and determine all their law suits, and decide the strifes and controversies which arose between them; it was too heavy for him, and brought too much trouble and incumbrance upon him.
"How can I myself alone bear your cumbrance, and your burden, and your strife?" The burden and cumbrance of the nation are the nation itself, with all its affairs and transactions, which pressed upon the shoulders of Moses.
Your burden - The trouble of ruling and managing so perverse a people. Your strife - Your contentions among yourselves, for the determnination whereof the elders were appointed.
*More commentary available at chapter level.