If ‘$$\times$$’ means ‘$$\div$$’, ‘$$-$$’ means ‘$$\times$$’, ‘$$\div$$’ means ‘$$+$$’ and ‘$$+$$’ means ‘$$-$$’ then
$$(3 - 15 \div 11) \times 8 + 7 = ?$$
= $$(3 \times 15 + 11)\div 8 - 7$$
= $$(45 + 11)\div 8 - 7$$
= $$(56)\div 8 - 7$$
= 7-7
= 0
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