9 + 3 = 3 + 9

4(x + y) = 4x + 4y

9 x (3 x 2) = (9 x 3) x 2

0 + m = m

a + (- a) = 0

7 x (1/7) = 1

7 x 1 = 1

7a + 2 = a(7) + 2

7 + (a + 2) = (7 + a) + 2

7(a + 2) = 7a + 14

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