inv {{1, 20, 20^2}, {1, 10, 10^2}, {1, 0, 0}}.{1/0.2, 1/0.7, 1}inv {{1, 20, 20^2}, {1, 10, 10^2}, {1, 0, 0}}.{1/0.2, 1/0.7, 1}

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