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When considering the first mass, I pretend that masses m2 and m3 are one mass and I call it M, so

<--m1*g---(m1)---T1-->

<--Mg-----(M)----T1-->

a

_{m1}=-a

_{M}

-m1*g+T=m1*a

-Mg+T=-Ma

I substract the two equations and get,

a

_{m1}=g(m1-M)/(M+m1)

At this point I stop, because the book already says I'm wrong. The book get a=g(4m2m3-m1m2-m1m3)/(4m2m3+m1m2+m1m3).

What did I do wrong?