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3-x-x-9-4<0 ∧ x∈(-∞,-4)
3-x-x-9-4<0
-2x-10<0
-2x<10
x>-5
x-x-9+3+4<0 ∧ x∈<-4,3)
x-x-9+3+4<0
-2<0
x∈R
x+x-9-3+4<0 ∧ x∈<3,+∞)
x+x-9-3+4<0
2x-8<0
2x<8
x<4
x∈(-5,4)