-90
(when you add a negative you simply subtract so -40-50 is -90)
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50 + 40 + 40 + 40 + 30 + 30 + 20 + 10 = 260
-16 + - 40 = -(16 + 40) = -56
It is so very simple and quick to get the answer if you use the calculator that comes with your computer. So why not give it a try?
-40 + 70 = 30