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4x 1 7 * 2x 2 0
4x 1 7 * 2x 2 0 pictures 5
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4x 1 7 * 2x 2 0
4x 1 7 * 2x 2 0
1 2 4x 3 2x 0 7 )u003d- 2 4
5 2x 1 )+ 7 4x 2 )u003d 0
