3(a+3b)-2(2a+b)=7b-a
3a+9b-4a-2b=7b-a
-а+7b=7b-a
7b-a=7b-a
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3(a+3b)-2(2a+b)=7b-a
3a+9b-4a-2b=7b-a
-а+7b=7b-a
7b-a=7b-a