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2x 1 x 7 3x 4 x 1
2x 1 x 7 3x 4 x 1 pictures 5
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2x 1 x
2x 1 x 7 3x 4 x 1
x 7 )( x 7 )-( 3x 1 )( x 1 )u003d 4 2x 2
2x 1 x 7 3x 4 x 1
