what machines at gym burn most calories?

I just joined a gym and want to lose about 10-15 pounds in 10 weeks. I want to focus on burning calories and toning a little. but my main focus is calorie burning.

my question is what machines are the best to use to burn the most calories? I've been jogging on the treadmill, elliptical, stationary bike and the stairmaster. i switch off between the four of those and use 2-3 each time i go. is that good? any other suggestions?
 
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