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How can I calculate the acceleration in this system?

Homework Statement
I failed to understand how to compute acceleration here , where we do have an accelerated pulley holding two masses
Help me please
Homework Equations
First of all, consider one block of them, and using only variables (don't substitute with numbers), try to find its acceleration.
Hint : What forces are acting upon each block?


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Alternatively, if you are in an elevator accelerating up with acceleration ##a## and you stand on a scale, your weight reading will be ##m(g+a)##. Now imagine the pulley being attached to the ceiling of this elevator and you put ##m_1## and ##m_2## on the scale before attaching them to the rope. What would the scale read? Therefore, ...

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