Explicație pas cu pas:
[tex]\left \{ {{2x + 1 > 0} \atop {x - 3 < 0}} = > \left \{ {{2x > - 1} \atop {x < 3}} \right.\right. \\ [/tex]
[tex]= > \left \{ {{x > - \frac{1}{2} } \atop {x < 3}} = > \left \{ {{- \frac{1}{2} < x < + \infty } \atop { - \infty < x < 3}} \right.\right. \\ [/tex]
[tex] = > - \frac{1}{2} < x < 3 \\ [/tex]
x ∈ (-½; 3)
