50-[20-{7-(50÷10)+4×3}]
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Step-by-step explanation:
50-[20-{7-(50÷10) +4×3}]
50-[20-{7-5+4×3}]
50-[ 20-{7-5+12}]
50-[20-[7-17}]
50-[20-10}]
50-[10]
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