Solve the equation : $7 x^{7} + x^{2} + x = ?$ if $x = 7$

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Solution

Given,

$7 x^{7} + x^{2} + x$

$x = 7$

$= 7 (7^{7}) + 7^{2} + 7$

$= 7 (823, 543) + 49 + 7$

$= 5, 764, 801 + 56$

$= 5, 764, 857$

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