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2014-05-21T11:14:59+03:00
2a+3b=15/*3
3a+2b =11/-2

6a+9b=45
-6b-4b=-22
-----------------------(+)
   /5b=23
b=23/5

6a+9*23/5=45
30a+207=225
30a=18
a=18/30
a=9/15
a=3/5

a/b=
3/5 supra 23/5=
3/5 *5/23=
3/23