x²-x-6<x²+7x-3x-21+4x
x²-x-x²-7x+3x-4x<-21+6
-9x <-15
x <-15/-9
x<5/3
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x²-x-6<x²+7x-3x-21+4x
x²-x-x²-7x+3x-4x<-21+6
-9x <-15
x <-15/-9
x<5/3
x-3 fois x+7 +4 fois x