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12x - 7x > 11 + 4
5x > 15
5x/5 > 15/5
x > 3 .5/5
x > 3
Solución :
x ∈ (3, ∞)
12x - 4 ≥ 7x + 11
12x - 7x ≥ 11 + 4
5x ≥ 15
x ≥ 15/3
x ≥ 5
<----------------i------------------------------->
5
x ∈ (3, ∞)