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2. 13 - 8 : 2 × 5 + 6 = 13 - 4 × 5 + 6 = 13 - 20 + 6 = -1
13+32:20-20
13+1,6-20
14,6-20=-5,4
2. 13-8:2x5+6
13-4x5+6
13-20+6
13-26=-13