The set of all values of aa for which lim⁡ ([x−5]−[2x+2])=0
x→a
where [∝]denotes the greatest integer less than or equal to ∝∝ is equal to
• [−7.5,−6.5)
• (−7.5,−6.5)
• (−7.5,−6.5]
• [−7.5,−6.5]