Simplify of 640÷80×4-4 of20+639-72÷9
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640÷80×4-4 of 20+638-72÷9
= 80×4-4 of 659-8
=320-4 of 651
=316 of 651
= 80×4-4 of 659-8
=320-4 of 651
=316 of 651
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