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. 2013 Sep 10;4:584. doi: 10.3389/fpsyg.2013.00584
1. 7 − 3 = _____________________________________ 2. −10 – 4 = _________________________________
3. 5 − 2 = _____________________________________ 4. −12 – −5 = _______________________________
5. −6 −3 = ___________________________________ 6.4 – −9 = __________________________________