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do u jist add the box a and box b with the 10kg?

i only know how to solve a simple pulley system but idk how to solve it if there iis a box in the top of the box. pls help me thank u

btw if u don't get it and u want to solve it here's the given

box a has 45kg

box b has 50kg

acceleration is 0.63m/s upward and to the left

but my ques is only how do i solve if there is a box on the top of the box thankd