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The problem asks us to simplify the expression .
First, simplify the expression in the denominator:
Now, the expression becomes:
Next, simplify the fraction by canceling out common factors in the numerator and the denominator:
Further simplify the fraction by dividing both the numerator and the denominator by their greatest common divisor, which is 2:
Thus, the simplified form of the expression is .
Therefore, the solution to the problem is .
\( 100-(30-21)= \)
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