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= 2,5 + ( 2/3 - 9/5 * 5/6) : (- 1/27) =
= 2,5 + (2/3 - 3/2) : (- 1/27) =
= 2,5 + (4/6 - 9/6) : (- 1/27) =
= 2,5 + (- 5/6) * (- 27) =
= 2,5 + 135/6 =
= 2,5 + 22,5 =
= 25
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