How to calculate the net cash flow from investing activites?

[bing49]

It seems really simple but apparently I'm missing something.

Creative Sound Systems sold investments, land, and its own common stock for $29.9 million, $15.5 million, and $40.6 million, respectively. Creative Sound Systems also purchased treasury stock, equipment, and a patent for $20.2 million, $24.9 million, and $11.2 million, respectively.

I got 142.3 million.