To solve the equation \( x - \frac{9}{4} = -\frac{3}{8} \), follow these steps:
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Add \(\frac{9}{4}\) to both sides of the equation:
\[ x = -\frac{3}{8} + \frac{9}{4} \]
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To add these fractions, find a common denominator. The least common denominator (LCD) of 8 and 4 is 8.
Convert \(\frac{9}{4}\) to eighths:
\[ \frac{9}{4} = \frac{9 \times 2}{4 \times 2} = \frac{18}{8} \]
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Now substitute this back into the equation:
\[ x = -\frac{3}{8} + \frac{18}{8} \]
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Combine the fractions:
\[ x = \frac{-3 + 18}{8} = \frac{15}{8} \]
Thus, the solution to the equation is:
\[ \boxed{\frac{15}{8}} \]