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- (1-7/10X+1/10XX)=0
- X = 7/20 +/- (49/400 - 1/10)
- X = 7/20 +/- (9/400)
- X = 7/20 +/- 3/20
- X = 4/20, 10/20
- X = 1/5, 1/2
- (1-1/2X)(1-1/5X)=0
- X = 2, 5
- ??????????
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