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Question
21 – 3 (b - 7) = b+ 20
Solution
21 – 3 (b - 7) = b+ 20
⇒ 21 - 3b + 21 = b + 20
⇒ - 3b + 42 = b + 20
⇒ - 3b - b = 20 - 42
⇒ - 4b = - 22
⇒ b = `(-22)/(-4) = 11/2`
∴ b = `11/2 = 5 1/2`
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