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Electrostatic potential → electric field

In some region of space, the electrostatic potential is given by,

$\varphi = (872x-9811y-1621z)^3$ [V].

Here $x$, $y$, and $z$ are measured in meters. What is the electric field in this region?

$\vec{E}$ = $\hat{x}$ + $\hat{y}$ + $\hat{z} \; \left[ \text{V/m} \right]$