Answer
$d = 2.091$
Work Step by Step
$7d^{5} + 20 = 300$
$7d^{5} = 300 - 20$
$7d^{5} = 280$
$d^{5} = 40$
$d = 40^{\frac{1}{5}}$
$d = 2.09127...$
$d = 2.091$
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