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Mathematics 15 Online
OpenStudy (anonymous):

I am thinking of a number. It is increased by 7. The sum is 21. What is my number? Rewarded fan + medal

jimthompson5910 (jim_thompson5910):

|dw:1419132327047:dw|

jimthompson5910 (jim_thompson5910):

call this unknown number x for now |dw:1419132341985:dw|

jimthompson5910 (jim_thompson5910):

|dw:1419132358202:dw|

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