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⇒ [restamos 4 a todo]
-11<2x<4
⇒ [dividimos todo entre 2]
<x<2
Luego,
x ∈ (,2)
Evaluamos,
x = -11 ⇒ 2x+4 = -11+4 = -7
x = 2 ⇒2x+4 = 4+4 = 8