8 - (-30) = 8 + 30 = 38
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-8 - (-13) = - 8 + 13 = +5 ( minus a minus is a plus)
10 minus -20 is 30.
-4 minus -34 is 30
38
8 minus negative three or 8--3 equal positive 11. The double negative converts the minus sign into a plus sign and the negative into a positive.