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(d -10) + (d ÷ 3) for d = 21. explain
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(d -10) + (d ÷ 3) for d = 21. explain

User Cybran
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Substitute the number 21 for all the letter d's:

(21-10) + (21/3) = ?

11 + 7 = 18

User Jhondge
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