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x-5≥0 o x-5 ≤0
x-4≥0 0 x-4≤0
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x≥5 o x≤5
x≥4 0 x≤4
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para tener una idea del comportamiento te recomiendo dibujar la recta real
y se ve que el intervalo desde [5,∞)U(-∞,4]