Question

21 - 3(b - 7) = b + 20​

Answer 1

Answer:

b = -5

Step-by-step explanation:

$21 -3(b - 7) = b + 20 \\ 21 - 3b - 21 = b + 20 \\ - 3b = b + 20 \\ - 3b - b = 20 \\ - 4b = 20 \\ b = - 5$

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