57 - LX (10 +5) - 3х2 1 - 10
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Answer:
Step-by-step explanation:
57 - LX (10+5) - 3x21 - 10
=57-60 ( 10+5) -3x21 -10
=57-60 (15)- 3x21 - 10
=57-900-63-10
=57-973
= -916
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