starting at 0 on a number line a point is moved 21 units, then 53 units, then 721 units and -50 units where has the point moved to? HELP?

david2014-09-13T12:44:39Z

21 + 53 + 721 - 50 =

10

?2014-09-13T12:57:28Z

THANK YOU SO MUCH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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