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This is what I've done so far.
=> (2x+1) > 0
=> x > -1/2
Not sure if that's right.

It should actually be -1/2 < x < 0.
I can't figure out how to get the 0. It is correct logically.

Thanks!
Do you have a solution that can be written using mathematical symbols (i.e not a graph)?

I think I figured it out. I used a sign table.

Thanks for your help.