(-2/3+(+6 4/5))+(-5/6+ (-2,3))

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To simplify this expression, we first need to convert all mixed numbers to improper fractions:

-2/3 + 6 4/5 = -2/3 + 34/5
= -10/15 + 34/5
= -10/15 + 102/15
= 92/15

Next:

-5/6 + -2 3/10 = -5/6 + -23/10
= -25/30 + -69/30
= -94/30
= -47/15

Therefore, the simplified expression is: 92/15 + (-47/15) = 45/15 = 3