(42+19)+21=42+(19+21)
65+32-17>65+31-18
89-27-36=90-27-36
58+18+24>18+24+53
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(42+19)+21=42+(19+21)
65+32-17>65+31-18
89-27-36=90-27-36
58+18+24>18+24+53