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Yes. That's enough to make a difference.
BUT I think you'll see a bigger difference if you do 20 minutes of weights and the rest cardio. Because while you can't spot-reduce, you CAN firm and tone. Having seen you in person, I don't believe that the doughiness that bothers you is from a big ole layer of fat. I suspect that firmer muscle tissue will do the trick. AND since muscle burns more calories than fat even at rest, you'll raise your metabolism and get a double whammy.
Plus, I think you'll secretly really enjoy the strength building. Just an intuition....
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