Solve:
$2 x - 5 [7 - (x - 6) + 3 x] - 28 = 39$

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Solution

$2 x - 5 [7 - (x - 6) + 3 x] - 28 = 39$

$\Rightarrow 2 x - 5 (7 - x + 6 + 3 x) = 39 + 28$

$\Rightarrow 2 x - 5 (13 + 2 x) = 67$

$\Rightarrow 2 x - 65 - 10 x = 67$

$\Rightarrow - 8 x = 67 + 65$

$\Rightarrow x = \frac{132}{- 8} = - \frac{33}{2}$

Hence the value of $x$ is $- \frac{33}{2}$ .

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