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Anonymous
13 + 12 = 25
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Plus 12 plus -13 plus plus 1 can be rewritten in mathematical terms as: 12+(-13)+1 or 12-13+1 12-13+1 =-1+1 =0
6 + 12 - 5 = 13
6+8=14
yes it is
basically you asked what -28+21 which equals -7