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## Homework Statement

It is the review problem on p.131 of Physics for scientists and engineers ( Serway, 4th edition).

It is the classical problem of 2 blocks in an incline(with angle [itex]\theta[/itex]) with masses 2m and m (in order from bottom to the top of the incline) and 1 block suspended trough a pulley with mass M.

He asks to find M and give the answer as function of m, g, [itex]\theta[/itex].

## Homework Equations

I got to 2 equations, they are:

[itex]Mg =4ma+3mg\cos\theta[/itex]

and

[itex]a=\frac{g(M-3m\cos\theta)}{M+3m}[/itex]

I couldn't get to something that wasn't a form of M

^{2}+... and it get very strange.

Some tip?

## The Attempt at a Solution

It is above.