Pulleys and Acceleration

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Two blocks (M1=20 kg, M2=7.5 kg) can slide down two inclined planes with angles 57 deg and 45 deg, respectively. They are connected together by a cord and by a pulley (see figure) of negligible masses. If the coefficients of kinetic friction for the two blocks are mu1=0.45 and mu2=0.55, what is the acceleration of the system?

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