Simply 308+(-400)+512+(-318)
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2
= 308 + (-400) + 512 + (-318)
= 308 - 400 + 512 - 318
= 308 + 512 - 400 - 318
= 820 - 718
= 102
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0
308+(-400)+512+(-318)
308-400+512-318
-92+512-318
420-318
=102
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