687 - 453 + 234 = ?, 301 - 483 - 182 = ?, 601 - 217 + 384 = ?, 540 - 736 - 196 = ?, 304 - 725 - 421 = ?, 770 - 472 + 298 = ?, 344 - 978 - 634 = ?, 163 - 592 - 429 = ?,

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