Question:
Solve: 21b - 32 + 7b - 20b
Answer:
Given, 21b - 32 + 7b - 20b
= (21b + 7b) - 32 - 20b
= 28b - 32 - 20b
= (28b - 20b) - 32
= 8b - 32
So, 21b - 32 + 7b - 20b = 8b - 32
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