If x [–2 {–4 (–a)}] +5 [–2 {–2 (

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x [– 2 {– 4 (– a)}] + 5 [– 2 { – 2 (– a)} ] = 4 a
⇒ x × (– 8 a) + 5 × (– 4 a) = 4 a
⇒ x × (– 2) + 5 × (– 1) = 1
⇒ 2 x + 5 = – 1
⇒ 2 x = – 5 – 1 = – 6

⇒ x =	−6	= −3
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