Decimals, Fractions, Scientific Notation and Percentages?!

((2.1+16)×1517×106)÷6.4%\large \left ( \left ( 2.1 + \dfrac{1}{6} \right ) \times \dfrac{15}{17} \times 10^{-6} \right ) \div 6.4\%

The value of the above expression can be written as ab\dfrac {a}{b}, where aa and bb are coprime positive integers. Find a+ba+b.

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