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Mathematics 18 Online
OpenStudy (anonymous):

-3-15

OpenStudy (lgbasallote):

maybe this online calculator can help http://www.wolframalpha.com/input/?i=-3+-++15

OpenStudy (anonymous):

you can think of this as a factoring out problem. Try to factor out negative one from both -3 and -15

OpenStudy (anonymous):

-18

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