If x = 5, then which interval contains this solution (it was derived from the original linear equation shown in the picture since I solved for x).
a. ]– ∞, – 7]
b. ] – 7, 1]
c. ] 1, 7] ∞[
d. ]7, ∞[
What I am not sure is the symbols of the interval signs or brackets, if the number appears before or after does it change the meaning? I am reading about their definitions on this website, and an explanation for '∞[' is not provided. According to my knowledge the answer appears to be d. ]7, ∞[ but I cannot confirm, does someone have any explanations that could help me understand more fully?