Last time I have had problem with one task:
They questioned us to determine compartments in with that configuration will be on balance.
If that configuration must be on balance so acceleration must be 0. So we can compare forces working on that blocks.
The Attempt at a Solution
If we compare forces which working on that configuration we will go to moment that masses of that blocks will be reduced.
But this is not a solution of that task.
Sorry for my language. Thx for help