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16\left(\frac{7}{8}-\frac{x}{4}\right)-9=15
Multiply both sides of the equation by 24, the least common multiple of 3,8,4.
16\left(\frac{7}{8}-\frac{2x}{8}\right)-9=15
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 8 and 4 is 8. Multiply \frac{x}{4} times \frac{2}{2}.
16\times \frac{7-2x}{8}-9=15
Since \frac{7}{8} and \frac{2x}{8} have the same denominator, subtract them by subtracting their numerators.
2\left(7-2x\right)-9=15
Cancel out 8, the greatest common factor in 16 and 8.
14-4x-9=15
Use the distributive property to multiply 2 by 7-2x.
5-4x=15
Subtract 9 from 14 to get 5.
-4x=15-5
Subtract 5 from both sides.
-4x=10
Subtract 5 from 15 to get 10.
x=\frac{10}{-4}
Divide both sides by -4.
x=-\frac{5}{2}
Reduce the fraction \frac{10}{-4} to lowest terms by extracting and canceling out 2.