Several replies have mentioned to push on the top rail of the bottom sash. That gives you more purchase and better angle for more leverage. Also most of our windows are vinyl so they don't get painted. Make sure both window locks are unlocked. Most windows are tilt in for cleaning but they have to be opened a little before you can tilt them in. If you can get them opened and tilted in that is a good time to clean and lightly lubricate the edges of the sash and the channel they ride in . Invite some of your new neighbors over for coffee and I'm sure one of them will help you since they probably have the same windows.
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