(53/9÷53/36+5/4)×5/21=

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To solve this, we first need to simplify the expressions within the parentheses:

53/9 ÷ 53/36 = (53/9) * (36/53) = 4

Next, we add the result to 5/4:

4 + 5/4 = (16/4) + 5/4 = 21/4

Now, we multiply this result by 5/21:

(21/4) * (5/21) = 105/84 = 5/4

Therefore, the final answer is 5/4.