If ‘P’ means ‘$$-$$’, ‘Q’ means ‘$$\div$$’, ‘R’ means ‘$$+$$’, and ‘S’ means‘$$\times$$’, then:
525 Q 25 R 42 S 4 = ?
525 Q 25 R 42 S 4 = ?
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$$ 525 \div 25 + 42 \times 4 = x $$
$$ 21 + 168 = x $$
$$ 189 = x $$
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