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10 x (19 – 1) = 10 x 19 – 10 x 1 = 10 x 19 – 10 = x
2 x (1 – 1) = 2 x 1 – 2 x 1 = 2 x 1 – 2 = x
4 x (3 – 1) = 4 x 3 – 4 x 1 = 4 x 3 – 4 = x
5 x (10 – 1) = 5 x 10 – 5 x 1 = 5 x 10 –5 = x