003-045 How to find the acceleration of bodies and the tension force of the thread in each case?

Physics problem (Playlist 003 Newton's laws, momentum):
Masses m1 = 3 kg, m2 = 4 kg are connected by an inextensible weightless thread and lie on a horizontal table. The coefficient of friction between each weight and the table is 0.4. Directed horizontal force, modulo equal to 35 N and applied:
1) to a load of mass m1;
2) to a load of mass m2.
Find the acceleration of the bodies and the tension in the string in each case.
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TIME CODE (VIDEO CONTENTS 003-045)
00:00 - Problem condition
00:24 - Explanation and solution