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The common denominator of the two fractions is: 32*a

$ \frac{(-11*a)}{4 }= \frac{(-11*8*a*a)}{(4*8*a)} = \frac{(-88*a^2)}{(32*a)} $

$ \frac{11}{(8*a)} = \frac{(4*11)}{(4*8*a)} =\frac{ 44}{(32*a)} $

Fractions adjusted to a common denominator

$ \frac{(-11*a)}{4 }+\frac{ 11}{(8*a)} = \frac{(-88*a^2)}{(32*a)} +\frac{ 44}{(32*a)} $

$ \frac{(-88*a^2)}{(32*a)} +\frac{ 44}{(32*a)} = \frac{(44-88*a^2)}{(32*a)} $

$ \frac{(44-88*a^2)}{(32*a)} = \frac{(44-88*a^2)}{(32*a)} $

$ $

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