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The rule as a mapping for the translation of a rectangle is (x, y) - (x - 2y + 7). Which describes this translation?
a translation of 2 units down and 7 units to the right
a translation of 2 units down and 7 units to the left
a translation of 2 units to the right and 7 units up
a translation of 2 units to the left and 7 units up