(2x1) x7 - 2x (1x7), 3x (3x4) - (3x3) x 4, 5x (2x5) - (5x2) x5, 3x(2x6) - (3x2)x6, 2x(2x5) - (2x2) x5, (1x3) x6 - 1x (3x6), (8x3) x2 - 8x (3x2), 4x (4x5) - (4x4) x5,

associative property of multiplication

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