# Decimals, Fractions, Scientific Notation and Percentages?!

$\large \left ( \left ( 2.1 + \dfrac{1}{6} \right ) \times \dfrac{15}{17} \times 10^{-6} \right ) \div 6.4\%$

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

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