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