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Find a and b.
If -4 < x < 0, then a < x/2 < b.
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You are given the starting inequality
-4 < x < 0.
Divide all three terms by 2. You will get
-2 < x/2 < 0.
Compare it with a < x/2 < b.
Obviously, you should take a = -2, b = 0.
ANSWER. a = -2; b = 0.
Solved.