Решим пример:
$$(570 \cdot 409 - 43516 : 86 \cdot 275) : 4 - (73720 : 76 + 1668) \cdot 7$$
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$$570 \cdot 409 = 233130$$
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$$43516 : 86 = 506$$
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$$506 \cdot 275 = 139150$$
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$$233130 - 139150 = 93980$$
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$$93980 : 4 = 23495$$
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$$73720 : 76 = 970$$
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$$970 + 1668 = 2638$$
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$$2638 \cdot 7 = 18466$$
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$$23495 - 18466 = 5029$$
Ответ: 5029