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Simplify the expression 21b4 − 3b by combining like terms. 1. 18b5 2. 18b4 3. 21b4 − 3b 4. 18b3
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Simplify the expression 21b4 − 3b by combining like terms.

1. 18b5
2. 18b4
3. 21b4 − 3b
4. 18b3

User Noteness
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I think the answer is number 3
User Kirill Skomarovskiy
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