To simplify the expression \( \frac{5}{14}a + \left(-\frac{2}{5}c\right) + \frac{1}{8}b - \frac{2}{5}c + \frac{3}{8}b + \frac{7}{14}a \), we can combine like terms.
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Identify like terms:
- Terms with \( a \): \( \frac{5}{14}a \) and \( \frac{7}{14}a \)
- Terms with \( b \): \( \frac{1}{8}b \) and \( \frac{3}{8}b \)
- Terms with \( c \): \( -\frac{2}{5}c \) and \( -\frac{2}{5}c \)
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Combine like terms:
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For \( a \): \[ \frac{5}{14}a + \frac{7}{14}a = \left(\frac{5 + 7}{14}\right)a = \frac{12}{14}a = \frac{6}{7}a \]
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For \( b \): \[ \frac{1}{8}b + \frac{3}{8}b = \left(\frac{1 + 3}{8}\right)b = \frac{4}{8}b = \frac{1}{2}b \]
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For \( c \): \[ -\frac{2}{5}c - \frac{2}{5}c = -\left(\frac{2 + 2}{5}\right)c = -\frac{4}{5}c \]
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Putting it all together: Combining all the simplified terms, we have: \[ \frac{6}{7}a + \frac{1}{2}b - \frac{4}{5}c \]
Thus, the simplified expression is: \[ \frac{6}{7}a + \frac{1}{2}b - \frac{4}{5}c \]