10 -(5- [6+2 (7-7 7-4)1
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Step-by-step explanation:
10-(5-[6+2(7-77-4)1
= 10-(5-[6+2(7-81)1
= 10-(5-[6-148]1
= 10-(5-[-142]1
= 10-(5+142)1
= 10-147
= -137
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