If A is replaced by '$$+$$' if 'B' is replaced by '$$-$$'; 'C' is replaced by '$$\div$$'; and 'D' replaced by '$$\times$$' then find the value of 4 the following equation.
20 A 15 C 3 D 8 B 9
20 A 15 C 3 D 8 B 9
After replacing
$$20+15\ \div3\times\ 8-9$$
$$20+40-9$$
$$51$$
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