12-[7-{16-(18-6÷3×12)}]
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Step-by-step explanation:
12-[7-{16-(18-6÷3×12)}]
12-[7-{16-(18-2×12)}]
12-[7-{16-(18-24)}]
12-[7-{16-(-6)}]
12-[7-{16+6}]
12-[7-{22}]
12-[-15]
27
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