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1. Decomposing a vector in a basis ●●○○○ 20 ptsWrite the vector $x=(-5, -5, 5)$ as a linear combination of $p=(-2, 0, 1)$, $q=(1, 3, -1)$ and $r=(0, 4, 1)$, that is, find $\alpha$, $\beta$, $\gamma$ with $x=\alpha p+\beta q+\gamma r$.