8 25/100:1 1/10-(3-2 8/10*3/7):6/10

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To simplify this expression, let's first solve the operations within the parentheses.

Convert the mixed number to an improper fraction: ( 3 - \frac{210 + 8}{10} \frac{3}{7} ) \
( 3 - \frac{28}{10} \frac{3}{7} ) \
( 3 - \frac{28 3}{10*7} ) \
( 3 - \frac{84}{70} ) \
( 3 - \frac{12}{10} ) \
( 3 - 1.2 ) \
( 1.8 )

Now we have: ( 1 - 1.8 \div \frac{6}{10} )

Convert 1.8 to a fraction: ( 1.8 = \frac{18}{10} ) \
( \frac{18}{10} \div \frac{6}{10} ) \
( \frac{18}{10} * \frac{10}{6} ) \

Simplify: \
( \frac{1810}{106} ) \
( \frac{180}{60} ) \
( 3 )

Now we have: ( 1 - 3 )

Therefore, the result of the expression is -2.