simplify 80 ÷ 4 - 20 × 2 ÷ 3 of 4 ÷ 4 +30
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20-20×2 3×4÷4 30
20-40 3×1 30
20-40 3 30
20 3 30-40
53-40
13 and it is right answer
hope it is useful
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