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7 1/2 -[2 1/4 ÷{1 1/4 - 1/2 ( 1 1/2 - 1/3 - 1/6)}]
10 - [6 + {2(-4-1-2+3)}]
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Step-by-step explanation:
10-[6+{2(-4-1-2+3)}]
=10-[6+{2(-7+3)}]
=10-[6+{2×(-4)}]
=10-[6+{-8}]
=10-[6-8]
=10-[-2]
=10+2
=12
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