4x – [2 + {x – (3 – x)}] = 3x + 6⇒ 4x – [2 + (x – 3 + x)] = 3x + 6⇒ 4x – [2 + 2x – 3] = 3x + 6⇒ 4x – (2x – 1) = 3x + 6⇒ 4x – 2x + 1 = 3x + 6⇒ 2x + 1 = 3x + 6⇒ 2x – 3x = 6 – 1⇒ – x = 5⇒ x = – 5
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