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4\times \frac{9}{8}-\frac{\frac{7}{2}}{-2}
Divide 4 by \frac{8}{9} by multiplying 4 by the reciprocal of \frac{8}{9}.
\frac{4\times 9}{8}-\frac{\frac{7}{2}}{-2}
Express 4\times \frac{9}{8} as a single fraction.
\frac{36}{8}-\frac{\frac{7}{2}}{-2}
Multiply 4 and 9 to get 36.
\frac{9}{2}-\frac{\frac{7}{2}}{-2}
Reduce the fraction \frac{36}{8} to lowest terms by extracting and canceling out 4.
\frac{9}{2}-\frac{7}{2\left(-2\right)}
Express \frac{\frac{7}{2}}{-2} as a single fraction.
\frac{9}{2}-\frac{7}{-4}
Multiply 2 and -2 to get -4.
\frac{9}{2}-\left(-\frac{7}{4}\right)
Fraction \frac{7}{-4} can be rewritten as -\frac{7}{4} by extracting the negative sign.
\frac{9}{2}+\frac{7}{4}
The opposite of -\frac{7}{4} is \frac{7}{4}.
\frac{18}{4}+\frac{7}{4}
Least common multiple of 2 and 4 is 4. Convert \frac{9}{2} and \frac{7}{4} to fractions with denominator 4.
\frac{18+7}{4}
Since \frac{18}{4} and \frac{7}{4} have the same denominator, add them by adding their numerators.
\frac{25}{4}
Add 18 and 7 to get 25.