2а - [зь -{а- (-3Ь -2c)8c-5(2a-9c +2b)}]
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Step-by-step explanation:
2a-[3b-a+3b-2c+8c-5+2a-9c+2b]
2a-[-a+2a+3b+3b+2b-2c+8c-9c-5]
2a-[a+8b-3c-5]
-a+8b-3c-5
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