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/ \frac{a + 4a + 3a + 4 + 1 + 7}{3} = 15
\frac{a + 4a + 3a + 4 + 1 + 7}{3} = 15
February 22, 2026
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First, write the equation for the average of the three indices:
\frac{(a+4) + (4a+1) + (3a+7)}{3} = 15
Combine like terms in the numerator:
\frac{8a + 12}{3} = 15
Multiply both sides by 3 to eliminate the denominator:
8a + 12 = 45
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