numero 724 e 725
[(2-1/2)*(-3/2)^-1 -2/7*(7/2)^-1*-3^-1]*-3/4
[(3/2)*(2/3)-(2/7*7/2)*-1/3]*-3/4
[1-(1*-1/3)]*-3/4
[1+2/3]*-3/4
5/3*-3/4
-15/12
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