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3 3/7a+6-2a=a+9
3 3/7a-2a-a = 9-6
3 3/7a-3a=3
3/7a = 3 |* 7/3
a =21/3=7
24/7a-3a = 9-6
4/7a = 3 |* 7/4
a =5,25