Try to solve this without a calculator

Simplify the expression below.

999999×9999991+2+3+4+5+6+7+8+9+8+7+6+5+4+3+2+1\dfrac{999999\times999999}{1+2+3+4+5+6+7+8+9+8+7+6+5+4+3+2+1}

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