3) ((-∞ < x)∧(x < -19/2))∨((181/2 < x)∧(x < ∞))
6)
Х<31/2
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3) ((-∞ < x)∧(x < -19/2))∨((181/2 < x)∧(x < ∞))
х<-19/2
6)
Х<31/2