Solve $12 x^{7} + x^{7} + x$ for if $x = 7$ ?

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Solution

According to given question,

$12 x^{7} + x^{7} + x$

$⟹ 13 x^{7} + x$

At, $x = 7$ , this becomes,

$13 (7)^{7} + 7$

$⟹ 13 (823, 543) + 7$

$⟹ 10706059 + 7$

$⟹ 10706066$

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