Solve the equation.
$17 x^{7} + x^{7} + x = ?$ If $x = 7$

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Solution

If $x = 7$ , than $17 x^{7} + x^{7} + x = 18 x^{7} + x = f (x)$ (say)

substituting x = 7 into it

$f (x) = 18 (7)^{7} + 7 = 14823774 + 7 = 14823781$

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