Question

$21b - 32 + 7b - 20b$
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Answer 1

Step-by-step explanation:

Arrange the number with like terms

21b+7b-20b-32

8b-32

Thus the final answer is

$8b - 32$

Answer 2

21b-32+7b-20b

28b-20b-32

8b-32

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