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20 + 10 - 31 + 30 - 5 = 24
10 minus -20 is 30.
30 - 20 = 10
10 - 5 + 14324 + 12 + 30 - 1000 = 13371
-10
30
16.8 6.8 + 30 - 20 = 6.8 + 10 = = 16.8
10 + 20 = 30
50 + 40 + 40 + 40 + 30 + 30 + 20 + 10 = 260
10x3+8=80-60+? 30+8=20+? 38=20+? 38-20=? 18=? The answer is 18.