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5x 2 1 4x 7
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5x 2 1 4x 7
19 5 1 4x 1 2 7 5x
1 5 4x 7 )+ 2 5x
3 4x 1 )u003d 2 5x 7
4x 2 5x 1 3 7 x
4x 7 )( 3x 2 5x 1
(- 4x 2 6x 1 )+( 5x 7
6 1 4x )+ 7 2 5x )u003d 53 verify
6 1 4x )+ 7 2 5x )u003d 53
5x 2 1 4x 7 quadratic formula
5x 2 1 4x 7
