If ‘$$+$$’ means ‘$$-$$’, ‘$$-$$’ means ‘$$\times$$’, ‘$$\div$$’ means ‘$$+$$’ and ‘$$\times$$’ means ‘$$\div$$’, then
$$10 \times 5 \div 3 - 2 + 3 = ?$$
= $$10 \div 5 + 3 \times 2 - 3$$
= $$\frac{10}{5}+6-3$$
= $$2+3$$
= 5
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