If $8 x + 2 = 42$ find $x^{2}$

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Solution

$8 x + 2 = 42$

$\Rightarrow$ $8 x = 42 - 2$

$\Rightarrow$ $8 x = 40$

$\Rightarrow$ $x = 5$

$\Rightarrow$ $x^{2} = 25$

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