Simplify the following:
a) 90/7-[{6/11+(8/9÷4/5)of 7/11}-5]
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Step-by-step explanation:
90/7-[{6/11+(8/9÷4/5)÷7/11}-5]
90/7-[{6/11+40/36÷7/11}-5]
90/7-[{6/11+440/252}-5]
90/7-[1588/693-5]
90/7-[-1877/693]
10787/693
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