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28+x/39+x<0.01
28+x+39x/39 < 1/100
28+40x/39 < 1/100
3900 x 28 +3900 x 40x/39<3900x1/100
109200+4000x<39
4000x<39-109200
4000x<-109161
x<-109161/4000
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