Solution
Expresssion : $$x [-2 {-4 (-a)}] +5 [-2 {-2 (-a)}] = 4a$$
=> $$x [-2 \times 4a] + 5[-2 \times 2a] = 4a$$
=> $$-8ax + 5(-4a) = 4a$$
=> $$-8ax = 20a + 4a$$
=> $$x = -3$$
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